Jaycar MB3623 User manual

DIGITAL SMART 6/12/24V, 15A DC
AUTO-DETECTION BATTERY CHARGER
Suitable for Regular (Wet/ Flooded/ Sealed/ Maintenance Free) Lead Acid, Gel / SLA and Deep Cycle
Batteries between 20-200Ah

Please carefully read and follow the following safety and operating instructions.
Gases
When the battery is being charged you may notice bubbling in the fluid caused by the release
of gas. As the gas is flammable no naked flames should be used around the battery, and the
area should be kept well ventilated.
Because of this risk of explosive gas, only connect and disconnect the battery leads when the
mains supply is disconnected.
Type of batteries
This charger is only suitable for normal lead acid, sealed, leisure, gel or deep-cycle batteries
and should not be used to recharge any other type of battery.
Points of note
When not in use, store the charger in a dry area to avoid moisture.
Your Battery Charger is for INDOOR USE ONLY. Keep away from liquids, rain or snow.
This battery charger is NOT designed as power supply.
Do NOT recharge non-rechargeable batteries
During charging, the battery must be placed in a well ventilated area.
The battery terminal not connected to the chassis has to be connected first. The other
connection is to be made to the chassis, remote from the battery and fuel line. The battery
charger is then to be connected to the supply mains.
After charging, disconnect the battery charger from the supply mains. Then remove the
chassis connection and then the battery connection.
Repair
The Battery Charger should not be opened. Any attempt at modification or repair by the
user will entail the loss of your guarantee.
If the supply cord is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualified persons in order to avoid a hazard.
Danger / Precautions When Working with Batteries
This appliance is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have been
given supervision or instruction concerning use of the appliance by a person responsible for
their safety.
Children should be supervised to ensure that they do not play with the appliance.
Avoid getting battery fluid on your skin or clothes. It is acidic and can cause burns. If this
occurs, you should rinse the affected area with soap and water immediately. Seek medical
attention.
If acid enters eye, immediately flood eye with running cold water for at least 20 minutes
and get medical attention immediately.
Never charge a frozen battery. If battery fluid (electrolyte) becomes frozen, bring battery
into a warm area to allow battery to thaw before you begin charging.
Never place a battery on top of charger or vice versa.
Do not touch the battery clamps together when the charger is on.
Never operate charger if it has received a hard blow, been dropped, or otherwise damaged.
Take it to a qualified professional for inspection and repair.
Be sure to position the charger power cord to prevent it from being stepped on, tripped
over, or damaged.
Never pull out the plug by the cord when unplugging the charger. Pulling on the cord may
cause damage to the cord or the plug.
Never smoke or allow a spark or flame in vicinity of battery or Engine.
Do not drop a metal tool on the battery. The resulting spark or short-circuit on the battery
of other electrical part may cause an explosion.
Remove personal metal items such as rings, bracelets, necklaces, and watches when
working with a lead-acid battery.
A lead-acid battery can produce a short-circuit current high enough to weld a ring or the
like to metal, causing severe burns.
IMPORTANT SAFETY INSTRUCTIONS

FEATURES
Automatic and Intelligent 5-Stage Charging Curve
MB-3623 is controlled by a 12-bit AD microprocessor with 4/5-stage charging characteristic for
charging batteries lawnmower, automobiles, motorcycles, snow mobiles, tractors, personal
watercraft, boats, minibus, coach, truck, etc.
A microprocessor senses the condition of the battery and controls the regulator to provide the
right current and voltage to the battery (charging characteristic). This will give the best effect
on charging and give the longest life to battery.
Charging characteristic:
Gel Cell/SLA/Regular (4-Stage) Deep Cycle (5-Stage)
Soft Start: Initial battery test to determine battery condition. If the battery is severely
discharged, charger will begin the Soft Start stage. Charging starts with reduced current
until battery voltage reaches a voltage suitable for bulk charging.
Bulk: Major charging stage where the battery receives the majority of its charge. During
this stage the battery brought to 60 - 80% of its charge. MB-3623 charger delivers
maximum current until the terminal voltage has risen to the set level of:
- 7.1V (6V Battery); 14,2V (12V Battery); 28.4V (24V Battery) for Wet/ Flooded
Lead Acid, MF battery selection
- 7V (6V Battery); 14,0V (12V Battery); 28V (24V Battery) for Gel/ SLA battery
selection
- 7.2V (6V Battery); 14,4V (12V Battery); 28.8V (24V Battery) for Deep Cycle
selection.
Absorption: Completes the charge up to virtually 100% at a constant voltage. The
current tapers off after the current reached the minimum level.
•
 Boost: (Only for Deep cycle battery) the battery is charged deeply at a constant current and
increased voltage to boost the charge capacity of the battery.
•
 Float (Maintenance):
oFor “STD” selection: The maintenance mode is charging at constant voltage,
keeping the batteries at 100% charge. Normal charging mode is time-limited (max 10
days) while Float mode charges indefinitely without damaging the battery.
oFor “DEEP” selection: The maintenance mode is using pulse charge. When the
battery voltage reaches upper limit (varied according to temperature), the charger
will stop supplying power and until the battery drops to 13,0V, it will supply
constant current again until the battery reaches upper limit. This will go in cycle
until the charging process has been stopped manually. This keeps the battery in
perfect condition when it is not in use. The charger can be connected for months
keeping the batteries fresh.

6V Battery(Voltage)
12V Battery(Voltage)
Charging characteristic at 6V:
Charging characteristic at 12V:
Charging characteristic at 24V:
20～28.8V
Gel Cell/SLA:28.0V
Regular:28.4V
Deep Cycle:28.8V
27.22V(at:25℃)
Auto
Detect
16～20V
2A
2A
2/7A
<2/7A
<0.5/1A
10 Minute(max)
9 Hour(max)
36 Hour(max)
24V Battery(Voltage)
10
～
14.4V
Gel
Cell/SLA:14.0V
Regular:14.2V
Deep Cycle:14.4V
13.61V(at:25℃)
Auto
8～10V
Detect
2/7/15A
Current(Amperes)
<2/7/15A
2A
2A
<0.5/1A
10
Minute(max)
9
Hour(max)
36
Hour(max)
Gel
Cell/SLA:7.0V
Regular:7.1V
Deep Cycle:7.2V
6.80V(at:25℃)
5
～
7.2V
Auto
Detect
3
～
5V
2A
2A
2A
Current(Amperes)
<2A
<0.5A
10
Minute(max)
9 Hour(max)
36
Hour(max)
Current(Amperes)

LED display
The unit is built with LED display for showing charger status:
REVERSE – RED LED – alligator clamps are connected in reverse polarity.
FAULT - RED LED – Battery Fault.
CHARGING – AMBER LED – The charger is charging to the battery.
FULL - GREEN LED – The battery is fully charged and the charger is in maintenance mode.
3 x 7 Segment LED Main display – Indicating charging current, battery voltage and
charging %
Memory Function
If black out or the AC plug is disconnected from the mains supply, the battery charger will turn
to memory mode and “- - -” illuminates on LED display. The charging mode and status will be
recorded in the charger’s memory. Once power is resumed, MB-3623 will resume the charging
process at the previous mode.
Remark:
- Memory function works on the condition that unit is connected with a
battery which is at or over 6V.
- If prolonged black out is expected, please disconnect the unit from both mains
and battery to reset the memory function.
NOTE: The memory function consumes power from battery and may run it flat.
Temperature Compensation
A sensor will automatically adjust the charging voltage if the temperature deviates between –
20°C to +50°C. At a high temperature environment, MB-3623 lowers the output voltage and
at a freezing condition, the unit will adjust a higher output voltage.
Voltage compensation
Because of some voltage drop in the cables, the actual voltage at the alligator clamps of the
unit can be lower than the charger output voltage. A special circuitry inside will monitor the
true input voltage to the battery and adjust the output voltage accordingly. This will maximize
the charging efficiency.
Reverse-polarity protection
This unit offers reverse-polarity protection, the RED “REVERSE” LED will illuminate, the buzzer
will warn the user and the charging process will not start. If this happens, unplug immediately
from mains, connect the red alligator clip to positive (+) battery post, and black alligator clip
to negative (-) post, then plug into the mains power and the charging process will start.
FUNCTIONAL ADVANTAGES

Short-circuit protection
Should you accidentally touch the alligator clamp together whilst the mains power is on, the
unit will not perform charging. Unplug from AC power mains, disconnect and start the
process again being careful not to cross the alligator clamps together.
Temperature Control Fan
To protect the charger from overheating, a fan is built-in for heat dispensation. Also to
increase the life span of the fan, a sensor will control the on-off of the fan, where the fan will
not be in use when the unit is not in a hot condition.
Buzzer Warning
A built-in buzzer will help to warn you when connect the alligator clamps to the battery
wrongly.
Cable Management
MB-3623 casing is designed with AC and DC cables storage compartment. This will help to
avoid cable damage and subsequently any possible danger to user.
Cut-Off Protection
If the DC clamps are pulled off from the battery while the AC plug is still connected to the
mains supply, the charger will automatically switch back to the standby mode and “2A”
illuminates on LED main display. All charging function is cut-off. You can move the unit to
recharge another battery; or, if you need to recharge the same battery, setting is needed to
be done again.
Other features
Anti-Spark Protection
PLEASE READ CAREFULLY BEFORE USING
Suitable for 6/12/24V Wet/Flooded Lead Acid, Maintenance Free (MF), Gel/ SLA
and Deep-cycle Batteries between 20-200Ah.
1. Charging your battery
It is essential to disconnect the battery from the car. This will avoid possible damage to the
alternator. To avoid damage to the bodywork from possible spillage, remove the battery
completely from the vehicle. It is advisable to use gloves when handling the battery, as there
is a high possibility of corrosive acid being on the outside of the battery.
2. Preparing the battery
Firstly, remove the caps from each cell and check that the level of the liquid is sufficient
in each cell. If it is below the recommended level, top up with de-ionized or distilled
water.
Note: Under no circumstances should tap water be used.
The battery caps should not be replaced until charging is complete. This allows any gases
formed during charging to escape. It is inevitable that some minor escape of acid will occur
during charging.
NOTE: For permanently sealed/MF battery, it is not necessary to carry out the above checks.
3. Connection
Connect the alligator clamps to the battery poles in the following order:
 Connect the positive charging lead (RED) to the positive terminal pole of the battery
(marked P or +).
Connect the negative charging lead (BLACK) to the negative pole of the battery (marked N
or -).
It is important to ensure that both alligator clamps are making good contact with their
respective terminals.
OPERATION

4. Control Panel
The Control Panel has several buttons and indicators.
Charge Rate Button sets the charge rate to one of the following:
2A DC Slow – Applicable on 6V/12V/24V battery, at a 2Amp DC Slow Rate Charging. The 2A
rate is not intended to be used as a trickle charger for larger batteries.
7A DC Normal – Applicable on 12V/24V Battery, at a 7Amp DC normal rate.
15A DC Fast – Applicable on 12V Battery only, at 15Amp DC fast rate.
Battery Selection Button sets the type of battery to be charged to one of the following:
Gel Cell / SLA – Select for charging all type of “Gel
Cell” & “SLA” batteries.
Regular – Select for charging all types of “lead acid”
batteries (SEALED/MF or WET/ FLOODED TYPE).
Deep – Select for charging Deep cycle type batteries.
Batteries should be marked with their type. If charging a
battery that is not marked, check the manual of the item that uses the battery. If the battery
type is unknown, use the “Gel Cell / SLA” setting.
Display mode button sets and shows one of the following readings:
Output current – This shows the selected/
programmed charging current.
Battery voltage –This shows the voltage of the
battery in DC, or Charging Voltage.
Charging % –This shows an estimate percent
of charge.

LED Indicators
On the front panel there are also 4 LED indicators for the following function:
REVERSE – Reverse Polarity. The alligator clamps have been connected at the wrong pole on
the battery. When this occurs, simply disconnect and reconnect the alligator clamps at the
correct pole, restart the charging process.
FAULT – Battery Fault. When this illuminates, this means the battery is broken/defective. If
the battery fault display persists after resetting the charger, the battery may be faulty and
unable to charge.
CHARGING – This shows the battery is in charging process.
FULL– This shows the battery is fully charged and the battery charger is in maintenance mode.
5. Charging Operation
A) Auto- Detection
Insert the AC plug into the AC mains supply (220-240 Volts AC only).
When beep sound is heard and “2A” illuminates on LED main display, press “Start” button and
start Auto-Detection function. “6A” “12A” “24A” is rotating on LED main display. After about
10 minutes, when detection process is completed, beep sound is heard. “b6” or “b12” or “b24”
illuminates on LED main display, indicating the type of detected battery- 6V, 12V or 24V.
Simultaneously, LED of relevant LED indicator (voltage) of 6V or 12V or 24V, and “Gel Cell/
SLA” illuminates on LED main display. Then, starts charging at pre-set charging rate at 2Amp.
Remark: 1) MB-3623 is programmed and pre-set the standard settings at:
- Charging Rate: 2Amp DC
- Battery Type: Gel Cell/SLA
2) Auto-Detection function is for detecting the type (voltage) of battery.
3) During auto-detection process (around 10minutes), unit does not response
to any command even pressing any button.
If you want to change the pre-set setting as above remark 1), press “Pause” button.
Then, press “Charge Rate” button for selecting the charging voltage you want.
Remark: For 6V Battery, only “2A” shows up on LED main display and this indicates only
2Amp is available.
For 12V Battery, “2A”, “7A”, “15A” shows up in each press and this indicates 2Amp,
7Amp, 15Amp DC charging rate are available for your selection. Leave at your designated
charging rate.
For 24V Battery, only “2A”, “7A” shows up in each press and this indicates only
2Amp, 7Amp DC charging rate are available for your selection (15A is not available). Leave at
your designated charging rate.
If you want to change the Battery Type from the pre-set Gel Cell/SLA to Regular (Lead-Acid)
or Deep Cycle, press “Battery Type” button and press again for selection from the list. Leave
at your designated battery type.
After above manual selection, press “Start” button and charging will start at the programmed
parameters as your designated selection.
B) Basic Operation - Manual Pre-set before Auto-Detection
Remark: Advantage of this operation is you can achieve quicker set-up of charging
parameters. But, please keep in mind:
For 6V battery, only 2A charge rate is applicable; for 12V battery, 2A, 7A, 15A charge rates
are applicable; for 24V, only 2A, 7A charge rates are applicable.

If you select non-applicable charging rate, after Auto-Detection process, charging will start at
factory pre-set charging rate at 2Amp and 2A illuminates on LED main display.
Insert the AC plug into the mains supply (220-240 Volts AC only).
When beep sound is heard and “2A” lights up on LED main Display, follow the below steps:
Step 1 – Press the Charge Rate button to select the charging power (current)
Remark: If you know it’s 6V battery, please don’t select “7A/ 15A” as they are not applicable.
If you know it’s 24V battery, please don’t select “15A” as this is not applicable.
Step 2 – Press the “Battery Type” Button to select the battery type for charging.
Step 3 – Press the “Start” Button to start the Auto-Detection Process.
After about 10 minutes, when detection process is completed, beep sound is heard. “b6” or
“b12” or “b24” lights up on LED display, indicating the type of detected battery- 6V, 12V or
24V. Simultaneously, LED of relevant LED indicator (voltage) of 6V or 12V or 24V, and “Gel
Cell/SLA” illuminate.
When your manually pre-set charge rate is applicable on detected type (voltage) of battery,
charging starts.
Remark:
If you select a non-applicable charging rate, charge will start at factory pre-set charging rate
at 2Amp and “2A” illuminates on LED main display. If you want to change the setting, please
press “Pause” button. Then, press “Charge Rate” button for selecting the charging voltage you
want.
Remark: For 6V Battery, only “2A” shows up on LED main display and this indicates only
2Amp is available.
For 12V Battery, “2A”, “7A”, “15A” illuminates in each press and this indicates 2Amp,
7Amp, 15Amp DC charging rate are available for your selection. Leave at your designated
charging rate.
For 24V Battery, only “2A”, “7A” illuminates in each press and this indicates only
2Amp, 7Amp DC charging rate are available for your selection (15A is not available). Leave at
your designated charging rate.
After above manual selection, press “Start” button and charging will start at the programmed
parameters as your designated selection.
NOTE:
Battery Fault – A few seconds after switching on to the operating mode, the LED indicator
“FAULT” will illuminate if the following occurs:
A. Low battery voltage - < 3 V
B. High battery voltage – > 28V
C. Battery short circuit or battery cell short circuit
Under these conditions, the battery charger will stop functioning. In the event of A, B or C, the
battery may be defective.
When the LED “FULL” illuminates, the battery is completely charged. The battery charger will
now go into maintenance mode. No attention is required until the battery is required for use
again.
When charging is complete
Switch off the mains supply, unplug the charger, and disconnect the alligator clamps from the
battery posts. Inspect the liquid levels in each cell and top up. If necessary, using the correct
fluid. Replace the caps. Any surplus fluid around the cell tops should be wiped off (this should
be done with extreme care as it may be acidic/corrosive).

Where appropriate, if the battery has been removed for charging, replace it and reconnect the
cables.
Protection
a) Reverse Polarity
If the alligator clamps are connected improperly to the battery terminals, the reverse polarity
LED will indicate the reversed polarity; warning buzzer will also sound and “E1” illuminates on
LED main display. When this occurs simply disconnect the battery charger from the AC power
and connect the alligator clamps correctly to the battery terminals. Reconnect the charger to
the AC power.
b) Over-Heat
If internal temperature of the unit is too high, warning buzzer will sound and “E3” illuminates
on LED main display. When this occurs simply disconnect from AC power mains and battery.
Let the unit cool down before charging again.
c) Over-Current
If output current is too high, warning buzzer will sound and “E4’ illuminates on LED main
display. When this occurs, please disconnect the unit from AC power mains and battery.
Try to re-set and recharge. Or set to lower output.
d) Short-Circuited
If “+” and “-” alligator clamps are shorted or voltage of battery is below 3V, warning buzzer
will sound and “[3.0” illuminates on LED main display. When this occurs, please disconnect
from AC power mains and check the polarity connection. If polarity connection is correct,
please check the battery.
e) Voltage of battery >28V
If voltage of battery is over 28V, warning buzzer will sound and “]28” illuminates on LED
main display. When this occurs, please disconnect from AC power mains and battery. Don’t try
to recharge that battery.
f) Detection Failure
If type (voltage) of battery is failed to be detected or the type of battery is not suitable to be
recharged by MB-3623, warning buzzer will sound and “E2” illuminates on LED main display.
When this occurs, please check the type of battery. For example, if the battery is lithium or for
electric car, do not charge with MB-3623. If type of battery is applicable for MB-3623, please
try to re-set and recharge. If situation persists, battery may be faulty.
It is essential to keep your battery regularly charged throughout the year, especially during
the winter months. In the winter the effectiveness of your car battery is reduced by the cold.
Oil is thick. Engines are difficult to start as the heater, windscreen wipers and lights are all
draining power. It is at this time that batteries have to be at peak power. If your battery is not
regularly maintained and kept fully charged, it can cause problems and a possible breakdown.
Listed are some helpful hints on how to keep your battery healthy in conjunction with your
Battery Charger.
Faulty Cells
Batteries are usually made with six cells. One of these cells can deteriorate or get damaged. If,
after several hours charging your battery is still flat, you should test the battery. Take
hydrometer readings from each cell in the battery. If one reading is lower than the others, this
could indicate a faulty cell.
MAINTENANCE AND CARE

Care
Sometimes the battery may appear flat, but this could simply be dirty or loose connections on
your battery terminals. It is important to maintain the leads on a regular basis. Do this by
removing the leads from the battery, clean the inside of each connector and terminal posts on
the battery, smear the terminal posts and connectors with Vaseline, refit in their correct
positions and tighten firmly.
It is essential to keep the electrolyte level above the plates.
Note, however, that you should not overfill it, as the electrolyte is strongly acidic. When
topping up do not use tap water. Always use distilled or de-ionized water. It is important to
keep the acid level up. If necessary, have it checked by a battery specialist.
Checking the condition of your battery
Using a hydrometer, which can be purchased, from most motor accessory stores, you can
check the specific gravity of the electrolyte in each cell. The hydrometer is use to suck up a
quantity of fluid from the cell. The weighted float inside the hydrometer will register the
condition of that cell. Put the fluid back into the cell after testing, taking care not to splash the
fluid about.
Trouble often can be corrected by the user. Please read this chart for possible solutions to
common problems.
PROBLEM POSSIBLE CAUSE SOLUTION
The battery is
connected and the
charger is on, but it
isn't charging.
The charger is not in
charging mode.
Press Mode Display button until
Battery % or Voltage reading comes
on.
Indicator lights are lit
in an erratic manner
not explained in the
manual.
A button may have
been pressed when
the charger was
plugged in.
The charger may be
defective.
Make sure nothing is touching the
control panel, then unplug the unit
and plug it in again. Consult place of
purchase in this case for assistance.
The green “FULL” LED
turns on a few
minutes after
connecting to the
battery.
The battery may be
fully charged or
recently charged,
leaving the battery
voltage high enough
to appear to be fully
charged.
If the battery is in a vehicle, turn the
headlights on for a few minutes to
reduce the battery voltage and try
charging again. Also try a lower
Charge Rate selection.
The charger was
unplugged from the
wall but the display is
still on.
The battery is
supplying the power
to the display.
Disconnect the battery.
TROUBLE SHOOTING

For 12V Normal Lead Acid, Sealed, Leisure, Gel or Deep Cycle Batteries
Input: 220V – 240V ~ 50Hz, 2.5A (Max.)
Output: 2A DC for 6/12/24V battery; 7A DC for 12/24V battery;
15A DC for 12V battery
Waste electrical products should not be disposed of with household waste.
Please recycle where facilities exist. Check with your local authority or retailer
for recycling advice.
REV1207
TECHNICAL SPECIFICATIONS
ENVIRONM
ENTAL PROTECTION