TME Xtrema User manual

1
TME Xtrema ™
Instruction Manual
(Firmware version 1.1.x) rev f
1. Introduction
Congratulations for purchasing TME's Xtrema Lithium (Li) Charger –Wattmeter. You are now
the owner of the most expandable, high end Li charging and monitoring system available. The
Xtrema combines the power of a high end Li charger with the versatility of a high end Wattmeter.
It also features a very useful temperature probe for monitoring your batteries and motor as well
as an over sized LCD display that shows all important data simultaneously. And the Xtrema has
an expansion port that allows for future plug in features and FREE lifetime software updates.
Our promise to you is to keep the Xtrema current with the latest Lithium advances and charger
features. This assures you that Xtrema is a solid value for many years to come. Your unit is fully
calibrated and tested during manufacturing and should provide many years of trouble free
operation.
Safety while charging is an integral part of the design of the Xtrema and a high priority at TME.
Two collective features actively prevent overcharging your battery. They serve as backup to the
normal constant voltage termination. The temperature cutoff provides the first level of protection.
It is set to shut off your charger if your battery goes over 104°F. This default temperature is
easily changeable to accommodate ambient temperature or for a more conservative cutoff. The
second method is a safety timer that aborts the charge if it takes longer than 120 minutes. This
default time can also be changed to match your charge rate.
Most people find that they can easily operate the Xtrema with no manual or with very little
information. However we recommend that you take the time to read this manual to discover
features, tips, and options that may not be immediately obvious.
For example the SETUP MENU allows you to customize your Xtrema's volts per cell,
safety timer and temperature cutoff.
The Volts per cell setting is particularly important when charging M1 High Power

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Hypersonic TM Lithium Ion cells manufactured by A123 Systems since the default is set
to charge common lithium polymer cells. You can also change volts per cell to charge
your Lithium Polymer batteries to a “storage charge”level for safe long term storage.
(NOTE: M1 cells do not require a “storage charge”and can be left charged at any level
without degrading performance)
Other interesting features you will discover in setup allows you to tailor the sounds the
Xtrema makes from No Sound (library mode), Beep Once, or the default Remind Me
(nag me) mode.
Manual Revisions:
By virtue of the expansion port, the Xtrema can be easily updated to incorporate new features. This means that as
we add new features, our instruction manual becomes a living document that constantly changes. We ship each
Xtrema with a printed QUICK STARTmanual and provide a CD with the latest manual that matches your Xtrema's
revision.
In this way we can provide you with the most up to date and complete manual without having to worry about
delaying updates because of a surplus of printed manuals. If you do not have a computer to print out your manual
you can take it to a friend or nearby library to print it out.
Updates and the latest news on the Xtrema can be located on our special Xtrema web site. Simply go to
www.theXtrema.com
Date Revision Description
07/24/06 1.0.0 First production release
08/15/06 1.1.x Added support for m1 cells from A123 Systems
In this manual the following conventions are used.
WARNING!
This signifies that the information presented is of concern for safety. Loss of life or
property may result if these warnings are not observed. At the very least damage to your
batteries or the Xtrema may result if you ignore these warnings.
TIP!
This signifies that the information presented is a tip that will help you obtain extra
enjoyment or utility of the Xtrema
Note:
This signifies that the information presented is a note that will help you understand a
particular feature of the Xtrema.

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
2. PRECAUTIONS –WARNING!
DO NOT CHARGE Lithium Polymer / ION batteries unattended. Ever!
USE POLARIZED CONNECTORS on the motor and battery to prevent reversal of leads.
Red to (+) and black to (-) Although we have circuitry to protect the Xtrema, in certain situations
serious damage to Motor, speed controller, battery and the Xtrema may result. Make sure that
your connectors can handle the maximum amps your motor can draw. The Xtrema can safely
measure 50 amps continuous and up to 100 amps for short durations when used as a
Wattmeter.
DO NOT CHARGE inside a vehicle
DO NOT CHARGE in direct sunlight
DO NOT CHARGE when ambient temperature is very HIGH or LOW.
DO NOT CHARGE when Li battery pack is hot or near flames
DO NOT USE an Automobile battery charger for the input power source. Use a regulated 12
to 13.8V DC supply or a 12 Volt Lead Acid battery capable of providing up to 20 amps
when charging at the maximum charge capacity. Your supply must maintain a minimum of
10.5V to a max of 15V to operate.
DO NOT CONNECT MULTIPLE EXTERNAL POWER SUPPLIES, METERS ETC. WITH
COMMON GROUNDS. All three (-) Negative leads on the Xtrema are at slightly different ground
potentials. Make sure if you connect external equipment that they are electrically isolated from
each other.
Xtrema CASE may get HOT when charging at high current.

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3. GENERAL OPERATION
The Xtrema's menu system was designed to be simple and intuitive. When you first connect the Xtrema
to the input power it will display the welcome screen for a few seconds before going to the main menu.
The welcome screen will display the firmware and hardware revision numbers which should correspond
to this manual.
When in the main menu a blinking square box is used to draw your attention to the current selection or
the choice that is to be made. All operation is via a single joystick that can be slightly moved in four
directions. In all cases operation is simple as noted below.
Up or down buttons on the joystick select menu or value options Left goes back to previous selection, right
button accepts option and goes to next step
Note:Pressing the joystick button to the Left while in the Main Menu will force the
Xtrema to shut off the display and go into a standby / off state. Momentarily pressing the joystick
again in any direction will restart the Xtrema back to normal operation
4.CHARGING a Lithium (Li) Battery
Overview - How the charger works
The Xtrema charges lithium batteries using the constant current to constant voltage method
(CC/CV) recommended by Lithium battery manufacturers. When you start a charge cycle, the
first thing the Xtrema does is test to see if the pack voltage is plausible for the cell count and
volts per cell you have selected. It does this during the TESTING phase
If all is OK, the Xtrema proceeds to increase the battery voltage just enough to maintain the
charge current you selected. This is called the constant current phase and is indicated with
"Charge CC" on the display. This constant current phase continues until the voltage eventually
climbs to the end value. (Volts per cell X cell count)
At that point the Xtrema enters the constant voltage phase indicated by "Charge CV" on the
Joystick
To Motor Under
Test
To Battery
Temperature
probe connector
Expansion
port
LCD
Display
POWER INPUT
(10.5 –15 volts DC)
Fan
(on side)

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display. Generally a battery is about 80 to 90% charged at this point. During this phase the
Xtrema holds the terminating voltage constant. As the battery charges up, it naturally begins to
draw less and less current as it "fills up". The Xtrema simply maintains a constant voltage on the
battery while watching the current go down. When the charge current drops to 1/10 of the initial
charge current, the Xtrema considers the battery fully charged. This is indicated by the word
"COMPLETE" on the display accompanied by repetitive beeps (unless beeps have been
disabled in Setup)
Connect the Xtrema to charge a battery
1 . Connect the red (+) and black (-) Xtrema inputs directly to a 12Volt automobile battery
or regulated power supply. Be careful to observe polarity.
Note:Make sure that the input voltage does not go below 10.5 Volts while charging or the
Xtrema will stop the charging process. Also charging will terminate if the voltage is above 15.0
Volts. When either of these conditions occurs the charge will terminate with a BAD INPT
message in the upper right status area of the display.
Note: Upon power up you will see the Xtrema welcome screen. This will display the
firmware and hardware revision and then beep. You will also notice that the fan will momentarily
come on and then shut off performing a power up fan test.
WARNING! DO NOT CONTINUE USING THE CHARGER if you do NOT hear or feel
the fan come on during power up. Also if you hear any unusual fan noise such as a bad bearing,
please return the unit for service. For long fan life, the fan is designed to only come on during high
power charging. The cooling it provides is an integral part of the Xtrema's power to charge large
packs.
WARNING! Your charger comes with factory default settings of 4.2 volts per cell. These settings
are ideal for obtaining the maximum charge from Lithium Polymer type cells. These settings must
be changed to 3.6 volts per cell when charging M1 High Power Hypersonic TM Lithium Ion
cells manufactured by A123 Systems. (See Li Settings section below before proceeding.)
2 . Connect the Li battery to the connector labeled “BATTERY”. CAUTION: Insure that
there is nothing connected to the “MOTOR”connector because the battery voltage will be present
there regardless of mode.
WARNING! USE POLARIZED CONNECTORS on the motor and battery to
prevent reversal of leads. Although we have circuitry to protect the Xtrema in case of reverse
battery, in certain situations serious damage to Motor, speed controller, battery and the Xtrema
may result if polarity is not observed. Therefore please use polarized connectors that match you
largest battery connector and use polarized adapters for smaller packs.
3 . You may optionally connect the temperature probe to the battery using the hook and
loop strap. We recommend always using the temperature probe for maximum safety during charge.
TIP! FOR MAXIMUM EFFECTIVENESS you will want to set the temperature cutoff to a
few degrees above the starting pack temperature. The factory default is 104°F. (To do this see
the instructions under the SETUP MENU.) For example if the pack temperature is 80°F then you
may want to set the temperature cutoff to 85°F. (You can determine the pack temperature by
attaching the thermometer to the battery with the supplied hook/loop band and temporarily
entering the Wattmeter function,)

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Lithium batteries are amazingly efficient during a charge and rarely go up in temperature at all
when charging properly.
WARNING! This feature is not designed to save your batteries. If a pack starts to
overheat, it is an early sign that the pack has already been damaged or that you have
programmed the current too high. Shutting off the Xtrema early (as a result of an overheated
battery) is designed to greatly minimize the probability of smoking or igniting the battery. UNDER
NO CIRCUMSTANCES should you rely on this feature in lieu of being close by while charging
batteries.
NEVER CHARGE Lithium Polymer / ION batteries unattended. Ever!
Set to Li Charge mode
4 . “Li Charger”should be selected on the display. (If not push the up or down 
buttons on the joystick until it is selected.) Press the joystick to the right to enter Li Charger
mode.
Xtrema Main Menu:
o ’Li Charger ‘
f “Wattmeter
f ..setup..
Select the cell count and milliamps
Slct ”2 750
Batt’3cell 2000mA‘
Mem: “5 5000
10 3500
5 . You will see four battery pack configurations that can be customized and
remembered by the Xtrema. These can represent four of your most common pack configuration.
Use the up or down buttons on the joystick to pick the pack you want. If none of them match,
pick any one of the four you want to change. In the next step, you will be able to change the values
to match your battery. Your setting will be automatically remembered the next time you enter this
menu. Press the right button when you have made your selection.
Note: If at first you do not see any pack like the ones you own, simply pick any one of the
batteries. You are ALWAYS given the option to change those settings of the memorized location
and the current pack.

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Update Memory 02
”
’3‘cell 2000 mA
“
6 . You now have an opportunity to change the cell count. If the cell count is correct then
simply press the right button to continue. If not, you can change the cell count at this point by
using the up or down button until the cell count you want is displayed. Notice that holding the
button down will rapidly advance through the numbers. When the cell count you want is displayed,
press the right button to continue.
Note: Unlike some other chargers the Xtrema does not require you to know the nominal
voltage of your pack. Most people refer to their Li Po batteries by the cell count (series count) the
nominal voltage will be calculated and presented to you for verification later.
Note: The memory location will only be updated if you actually proceed to charge the pack
so that the next time you go to charge, the Xtrema has remembered the last pack you charged. If
you hit the leftbutton at this point you will go back to step 5 and the cell value will revert to the
original value.
Update Memory 02
”
3 cell’2000‘mA
“
7 . You now have an opportunity to change the milliamps. For most Li batteries this is
normally set to 1C or basically the milliamp rating of the battery or less. If the milliamp charge rate
is correct then simply press the right button to continue. If not you can change the milliamps at
this point by using the up or down buttons until the milliamps you want is displayed. Notice
that holding the button up or down will rapidly advance through the numbers. When the milliamps
you want is displayed press the right button to continue.
Note: Unlike some other chargers the Xtrema does not require you to convert from amps to
milliamp or vise versa. Your battery packs are marked in milliamp so the Xtrema is set in milliamp
reducing the chance of conversion error.
WARNING! Make sure you set the charge rate to (or below) the recommended
milliamps suggested by the manufacturer. EXCEEDING the recommended settings may cause
your packs to overheat and produce smoke or fire. Typically the number of milliamps of charge
current is equal to the number of milliamp hours of capacity of the battery. This is also known as
charging the battery at 1C. M1 cells and other types of Lithium cells can be charged at a higher
rate. An M1 cell at 2300 mah capacity can be charged at up to 10 amps! Therefore, please refer
to the battery manufacturers suggested charge rate.
For example: If your battery is labeled as a 2500 mah battery then you typically charge a Lithium
polymer battery at a 2500 milliamp rate. You may also charge below that amount however your
charge time will increase and the max time in the SETUP MENU may need to be increased from
the default of 120 minutes. (See section on SETUP MENU)

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Start the Charge
11.10V 1200mA 03cell
4.20V/C 104F 120abt
Are You Sure?
’NO CHARGE? YES‘
8 . The Xtrema will give you one last chance to abort before charging. It will calculate the
Li voltage based on cell count and display the charge current that you have selected.
WARNING! DO NOT MISS THIS LAST OPPORTUNITY TO CHECK YOUR
SETTINGS. Wrong settings may cause some LI batteries to burst into FLAMES!
If all is OK, then start the charge by pressing the right button to continue. You may abort the
charge at any time by pressing any key  . When the charge has terminated, either by a fail
mode, user abort, or successful completion, the display will freeze with the terminating values and
the STATUS code will appear at the top right of the LCD. You may hit any key   to go back
to the Update Memory display. You may then start another charge cycle (starting at step 6) or you
may press the leftbutton to return to the main menu. In an emergency you may rapidly pull out
the battery to stop a charge. However, this is NOT a recommended way to abort the charge.
Note: At the beginning of a charge, the Xtrema will quickly test your pack to see if its
voltage is plausible with your selection. If it measures a voltage over your terminating voltage (cell
count X MAX volts/cell) it will abort and display a HI BAT V message. If it measures a
voltage below your minimum voltage (cell count X MIN volts/cell) it will abort and display a
LO BAT V message. The chart below indicates valid cell voltages for different types of
packs.
Volts/Cell LiPo M1
MAX up to 4.2 3.6
Nominal 3.7 3.3
MIN 3.0 2.0
Note: The Xtrema in the screen above shows the pack voltage as well as the milliamps and
cell count you have programmed. Up until now you have been programming the Xtrema in cell
count because quite frankly most people remember their 5 cell Lithium Polymer battery pack as a
5 cell pack and not as an 18.5 volt pack. Adding to the confusion a 5 cell M1 Lithium Ion pack
has a nominal voltage of 16.5 volts. Your 5 cell pack will most likely be labeled as an 18.5 or 16.5
volt pack so here is a good chance to double check to make sure you have selected the right cell
count.
Three other pieces of information are also shown in this display.
4.2 volts /per cell
(Change in setup
menu)
Calculated
nominal
pack voltage
Selected
charge
current
120 minute
abort timer
(Change in setup
menu)
Selected cell
count

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1.) The volts per cell (4.2V/C) determine the maximum capacity you put into the battery. The
default is 4.2 volts per cell commonly used by Lithium Polymer batteries. This is typically the
maximum charge that is recommended by LiPo battery manufacturers. The Xtrema allows you to
alter this rate in the SETUP MENU. It is very important to pay attention to this number since
M1 cells must be charged no more than 3.6 volts per cell. When charging Li Polymer cells, you
can make this number smaller to provide a more conservative charge. Charging conservatively
prolongs the life of the battery at the expense of reducing the run time per flight by a small percent.
2.) The max temperature cutoff (104F) is also shownin this final display before charging. This
too can be adjusted in the SETUP MENU. The default is 104°F but this temperature is best
adjusted to be only a few degrees above the starting battery temperature.
3.) The max safety timer (120abt) is also shown in this final display before charging. The
default abort timeis 120 minutes but you can and should make this time longer in case you charge
your battery at a conservative CURRENT setting. For example charging a 2000 mah battery at
1000 ma will take twice as long to charge than if you were charging it at 2000 ma. This is a very
conservative chargerate that should put a minimal stress on the battery while charging however,
you may want to consider changing the max safety timer to say 150- 240 minutes to allow the
extra charge time.
Note: After the charging has started, if you hit any key to abort the ABORTED!
Status will show and the unit will stop charging. Hit any key again to go to menu.
Note: After the charge cycle has ended the Xtrema will beep (if not silenced) to signify the
end of charge. The beeping will continue until you hit the joystick button in any direction. This will
shut off the beeping but will leave the display intact so that you can observe the terminating values
of the recent charge. You may also stop the beeping by simply removing the battery from the
charger. The display will show the final result until you push the joystick as described above.
(Remind me beep mode is assumed above)
Note: In order to extend the life of the fan, the Xtrema is programmed to turn the FAN ON
only when charging a battery with 50 watts or more power. Therefore you may not hear the fan
running when charging small batteries.
Charge Display –During a charge you will see the following display
Li03 cell Charg CC
In:13.80V Bat: 11.12V
Tmp: 72F Cur: 1200mA
00:30:49 C: 605mah
Number of Cells
expected ERROR / STATUS
( see section 8)
Actual Battery
Voltage while
charging
Actual Battery
Current while
charging
Cumulative
Charge dumped
into cell
Power Input
Voltage
Temperature probe
display. (displays none if
disconnected)
Total time since
start of charge

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5. Using the Wattmeter
Connect the Xtrema in between battery and motor
Connect the red (+) and black (-) Xtrema directly to a 12Volt automobile battery or regulated
power supply. Be careful to observe polarity.
Connect the Li battery to the connector labeled “BATTERY”
Connect your speed controller and motor to the connector labeled “MOTOR”
You may optionally connect the temperature probe to the battery, motor or your speed controller
using the hook and loop strap for monitoring purposes.
Set to Wattmeter mode
Xtrema Main Menu:
o ”Li Charger
f ’Wattmeter ‘
f “..setup..
“Wattmeter”should be selected on the display. (If not push the up or down buttons on the joystick
until it is selected.) Press the joystick to the right to enter Wattmeter mode.
2061.9 Watts 2.76 Hp
36.80 Volts
56.03 Amps 83F
’Exit 00:08:17 More‘
You are now able to measure Watts, amps, volts, temperature and even horsepower. Pressing the right 
button will allow you to toggle into the [STORED] mode which will display peak amps, minimum voltage,
max temperature as well as the calculated watts and horsepower.
2030.1 Watts 2.72 Hp
35.38 Volts minimum
57.88 Amps peak 89F
’Exit [STORED] More‘
Press the left button to return to the main menu.
Calculated
Watts Calculated
Horsepower
Actual
battery / motor
voltage
Actual
battery / motor
curent
Actual temperature
(battery, motor, controller, etc.)
Total Time Testing
(when [STORED] is diplayed values
represent recorded values)

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TIP! For “Volts minimum”to display properly you should connect the battery to the Xtrema
before you enter theWattmeter mode. Otherwise the minimum voltage displayed will be zero 0.00.
If you have already entered the Wattmeter mode simply push the joystick left once then 
right to temporarily go to the main menu and then re enter the Wattmeter mode
Also note that at any time you want to reset the minimum and peak settings you may simply go
back to the main menu temporarily as described above.
6. SETUP MENU
The setup menu allows you to customize the internal setting of the Xtrema. You enter the setup
menu from the main menu by selecting ..setup.. and pressing the joystick to the right.
Xtrema Main Menu:
o Li Charger
f ”Wattmeter
f ’..setup.. ‘
Upon entering the setup menu you will see three options. The first is Li Setup which allows
you to change charger settings such as volts per cell, the safety timer and the temperature cutoff.
The second option Beep Options lets you set up how the Xtrema makes sounds. The third
option Set Defaults merely restores all the factory default options.
Li Setup
Select LI SETUP from the setup menu and press the joystick to the right.
Choose one of the following by moving the up or down buttons and press the joystick
to the right.
Volts / Cell
This setup menu allows you to change the maximum voltage that the Xtrema stops charging. You can
program the Xtrema to charge from 3.6 volts / cell to 4.20 volts / cell. Note that this is a GLOBAL setting
meaning that it will affect all of your memorized pack configurations.
Choose the desired voltage by moving the up or down buttons and press the joystick to the right
when the displayed value is what you desire. You may abort the change by hitting the joystick left.
Why change the Volts per cell?
Different Lithium chemistries require charging up to different voltages. You can charge Lithium Polymer
packs lower to increase their longevity and for long term storage. The chart and descriptions below can
help you select the right volts / cell.
Recommended Volts/Cell LiPo M1
Charge 4.0 to 4.2 3.6
Storage 3.7 none

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M1 High Power Hypersonic TM Lithium Ion cells –3.60 volts per cell
The 3.6 volt setting is a special setting for M1 High Power Hypersonic TM Lithium Ion cells manufactured by
A123 Systems. When selected, the Xtrema will switch from constant current to constant voltage at 3.6 volts
per cell as required by these cells. Also when this setting is selected the battery voltage calculation
displayed just before charging (during the “Are you Sure?”window) is based on the nominal 3.3 volts per
cell multiplied by the selected cell count. Lastly when 3.6 volts per cell is selected the LO BAT V error
message will be triggered when the battery is below 2.0 volts per cell.
Lithium Polymer Cells –3.65 to 4.2 volts per cell
The factory default setting is 4.20 v/c and this provides you with the maximum capacity of common Lithium
Polymer cells. You may change this down to 3.7 volts for what is called a “storage charge”when using
lithium polymer cells. This allows you to charge your batteries to approximately 50% full charge and is the
factory recommended method for storing LiPo batteries long term. NOTE; M1 cells do not require a storage
charge and may be stored at any voltage without loss of performance.
Example: For a 3 cell pack 4.20 volts/cell equates to 3 X 4.2V or 12.60 volts max.
or For a 3 cell pack 3.70 volts/cell equates to 3 X 3.7V or 11.10 volts max.
The reason for all the in between values is that some manufacturers of Lithium Ion or polymer cells may
suggest a more conservative charge voltage. Or you may want to charge the batteries more conservatively
to extend their life. You now havethe option of charging at 4.15, 4.10, 4.05 or 4.00 volts per cell. The lower
in voltage you chose, the earlier the Xtrema will limit charging giving you slightly less capacity per charge.
The reason you may want to do this is to extend the cycle life of your batteries.
Choosing 4.15 volts/cell may only reduce the capacity of your charge by about 5 percent but it will extend
the useful life of your pack by many cycles.
Note: If you have reduced the volts/cell value and you try to charge batteries previously
charged at a higher volts/cell, they will cause the Xtrema to display a HI BAT V error
message. Simply discharge the battery below the desired max voltage.
Safety Timer
This setup menu allows you to change the maximum amount of time to allow for charging. The purpose is
to abort the charge when a battery is not charged in the amount of time expected. This may occur if a
shorted or weak cell prevents the pack voltage from climbing up to the expected voltage.
The default time is set to 120 minutes and this should be sufficient for charging at a 1C rate. (Ex. Charging
your 1000 mah battery at 1000 ma. Etc.) If you chose to charge at a lower rate, then you may want to
adjust this timer for a longer time period. The timer is adjustable from 0 minutes to 990 minutes in 10
minute increments. )
TIP! Zero 0 minutes effectively disables the charger and may be used in situations where
you may want to disarm the Xtrema from charging.
Choose the desired minutes by moving the up or down buttons and press the joystick to the right
when the displayed value is what you desire. You may abort the change by hitting the joystick left.
Temp Cutoff
This setup menu allows you to change the maximum temperature that will abort the charge cycle. This
feature is not designed to save your battery since overheating during charge is a sign of a damaged cell.
However this feature may prevent reaching battery temperatures resulting in thermal runaway that may
cause combustion. Hopefully this may prevent a Lithium battery fire.
Choose the desired temperature by moving the up or down buttons and press the joystick to the 

13
right when the displayed value is what you desire. You may abort the change by hitting the joystick left.
The default temperature is set to 104°F. The temperature is adjustable from 60°F to 130°F. FOR
MAXIMUM EFFECTIVENESS you will want to set the temperature cutoff to a few degrees above the
starting pack temperature. For example if the pack temperature is 80°F then you may want to set the
temperature cutoff to 85°F. (You can determine the pack temperature by attaching the thermometer to the
battery with the supplied hook/loop band and temporarily entering the Wattmeter function,)
Lithium batteries are amazingly efficient during a charge and rarely go up in temperature at all when
charging properly.
WARNING! This feature is not designed to save your batteries. If a pack starts to
overheat, it is an early sign that the pack has already been damaged or that you have
programmed the current too high. Shutting off the Xtrema early (as a result of an overheated
battery) is designed to greatly minimize the probability of smoking or igniting the battery. UNDER
NO CIRCUMSTANCES should you rely on this feature in lieu of being close by while charging
batteries.
NEVER CHARGE Lithium Polymer / ION batteries unattended. Ever!
TIP! There are several ways to test the thermometer. The easiest way is to set the cutoff
temperature a few degrees above room temperature but under body temperature (98°F). Start the
charge as you normally would and grab the temperature probe with your hand. Hold it tightly to
transfer your body heat to the probe and make the temperature rise. You should see the
temperature display climb while charging. It should abort the charge as soon as the temp display
reached the limit you set.
Beep Options
Select Beep Options from the setup menu and press the joystick to the right.
Choose one of the following by moving the up or down buttons and press the
joystick to the right.
Only one of the beep options is selected at a time. The option will automatically go back to the previously
selected option. This feature affects sounds that occur at all Status/Error messages except for CHARGE
CC and CHARGE CV which have no sounds associated with their states...
No Sound
Select this option if you prefer that the Xtrema make no sounds at all. All Error and Status messages will
still be displayed on the LCD screen however they will be silent.
Beep Once
Select this option if you prefer that the Xtrema alert you of problems or completion only once. All Error and
Status messages will remain displayed on the LCD screen until you exit the screen.
Remind Me (default)
Select this option if you prefer that the Xtrema alert you of problems or completion only repeating every 15
seconds. All Error and Status messages will remain displayed on the LCD screen until you exit the screen.
Set Defaults

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Select Set Defaults from the setup menu and press the joystick to the right.
This option will instantly set the Xtrema back to the factory default options.
The defaults are:
4.20 Volts / cell
120 minute (safety timer abort)
104°F (max temperature abort)
Remind Me (beep mode)

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7. Specifications
CHARGER SPECIFICATIONS:
# Cells: 1-10 cells
Input Voltage: 10.5V - 15V DC @ up to 20 AMPS
Input Connectors: Super heavy duty Alligator Clips with 3 ft. cord.
Case Size: 6.25 x 3.25 x 2.25 in. (159 x 83 x 57 mm.)
Weight: 22 oz. (624 grams)
Charger Output Connections: 14 Gauge Fine Strand Silicon Wire
Volts per Cell: 3.60V (m1 cells) - 4.20 volts in .05 volt steps
Charge Rate: 50mA - 8000mA in 50 mA steps (4000mA max @ 10 cells)
Battery Types: Lithium Ion, Lithium Polymer
Safety Timer: 10 - 990 minutes (120 default)
Fan: On only when needed for longer life.
Safety Temperature Cutoff: 60°F - 130°F (104°F default)
Display: 4 line X 20 character LCD display
Audible Alarms: Piezo Speaker alarms15 seconds, beep once or disable
WATTMETER SPECIFICATIONS
Input Supply Voltage: 6.5V - 15V DC < 40 ma
Wattmeter Output Connections: 14 Gauge Fine Strand Silicon Wire
Voltage Measurement: 0 - 60 V, resolution 0.01 V
Current Measurement: 0 - 100 A peak, 50 A continuous, resolution 0.01 A
Power Measurement: 0 - 6000 W, resolution 0.1 W.
Horsepower Measurement: 0 - 8.0 HP resolution .01 HP
Temperature Measurement: up to 302°F (150°C)

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8. ERROR/STATUS MESSAGES
OPEN CKT This error message is displayed if the charge is interrupted by an open circuit to the
battery. It is not recommended to stop the Xtrema from charging by disconnecting the
battery. Use the abort procedure by hitting any key instead.
MAX TIME This error message is displayed if the Xtrema has been charging longer than the Max
Safety time setting of the Safety Timer. The default is set to 120 minutes but this can be
modified from 0 to 990 minutes.
MAX TEMP This error message is displayed if the Xtrema's temperature probe hasmeasured greater
than than the Max Temp Cutoff setting of the temp cutoff. The default is set to 104°F but
can be modified from 60°F to 130°F.
HI BAT V This error message is displayed if the Xtrema detects during the testing phase prior to
charging that the battery to be charged voltage is higher than the cell count multiplied by
the Volts per Cell setting in the SETUP MENU. Typically this may indicate that the cell
count programmed into the Xtrema is lower than the actual pack. A low volts per cell
setting will also cause the same fault.
LO BAT V This error message is displayed if the Xtrema detects during the testing phase prior to
charging that the battery to be charged voltage is lower the cell count multiplied by 3.0
volts per cell. (2.0 Volts per cell for m1 cells) Typically this may indicate that the cell count
programmed into the Xtrema is higher than the actual pack.
CHCK BAT This error message is displayed if the Xtrema detects, during the testing phase prior to
charging, that the battery does not appear to be present or is connected backwards.
Check your wiring and battery connections other causes may be an open pack.
CHCK MOT This error message is displayed if the Xtrema detects, during the testing phase prior to
charging, battery current going to the motor leads. Make sure your motor is
disconnected and restart the charger.
ABORTED! This error message is displayed if the charge is interrupted by hitting the joystick in any
direction while charging. This is the preferred method to stop a charge cycle.
BAD INPT This error message is displayed if the charge is interrupted by the input voltage (12 volt
battery or power supply) has either dropped below 10.5 volts or gone above 15 Volts.
The display will indicate the last read voltage to help you determine the problem.
Charg CC This status message indicates that the charger has completed the initial testing phase
and has entered the constant current charging phase. It will continue to remain in this
state until the battery voltage has risen to the specified volts per cell setting in the setup
menu. This message makes no sound.
Charg CV This status message indicates that the charger has completed the initial constant current
charging phase and has entered the constant voltage charging phase. It will continue to
remain in this state until the battery current drops below 1/10of the initial constant
current charge rate. This message makes no sound.
COMPLETE This status message indicates that the charger has completed the complete charging
phase and has successfully charged your battery. It will continue to remain in this state
until the joystick button is pushed twice. The first push silences the unit and the second
push returns the charger to the selection menu.

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9. Warranty
LIMITED WARRANTY
The Xtrema is warranted to the original purchaser for 3 years from the date of purchase to be free from defects in material and workmanship. During
this period Tejera Microsystems Engineering Inc. will repair or replace, at their discretion, the defective unit. Warranty is not transferable and is
therefore limited to the original purchaser of the unit, This warranty does not apply to any unit which has been abused, improperly installed,
improperly used, used for purposes other than those purposes for which the unit was designed, handled roughly, damaged in shipment, nor to any unit
which has been altered or repaired by unauthorized personnel. Under no circumstances will the buyer be entitled to incidental or consequential
damages. Warranty coverage also requires proof of purchase date unless ordered direct from the manufacturer. This Limited Warranty gives you
specific legal rights; you may also have other rights which vary from state to state.
WARRANTY PROCEDURE:
A minimum charge of $7.00 to cover shipping and handling is required on all returned units after the first 30 days, and should be enclosed with the
unit. Be sure to enclose your Bill of Sale as proof of purchase with the unit. (A legible photocopy is acceptable.) In the event that the work is not
covered under the warranty, TME will attempt to contact the owner unless special instructions or a credit card number are received with the unit.
FREE LIFETIME UPDATES:
The Xtrema carries free firmware updates for the life of the product. For your convenience, downloadable updates will be made available online at
www.theXtrema.com or www.TMEnet.com . Activate your warranty online to receive product updates and upgrades! Go to:
www.TMEnet.com/register A special data cable will be required for your computer to connect to the Xtrema (not included) Alternately
you may return the Xtrema to us with $7.00 for return shipping to be updated at no charge.
REPAIRS:
For out of warranty repairs the standard repair fee per unit is up to 50% of the current list price plus $7.00 shipping and handling charges. You may
prepay by check, MO, VISA, MASTER CARD or DISCOVERY
ALL RETURNS MUST BE SENT TO: Tejera Microsystems Engineering, Inc., 11705 Boyette Rd #418, Riverview, Florida 33569 carefully pack and
ship the unit via the post office, UPS or FED EX, fully insured and prepaid.