BatteryMINDer 24041 User manual

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 1
INSTRUCTION MANUAL
BatteryMINDer® Model 24041*
Charger / Maintainer /
Desulphator-Conditioner
Rev. H-070708 P/N VDC24041-MNL
VDC Electronics, Inc.
147 D Woodbury Rd.
Huntington, NY 11743
www.batteryminders.com
[email protected]
READ AND SAVE THESE INSTRUCTIONS
*NOT for use with
Aviation Type 24-V Batteries
2 A
9LL=JQ'#(=J¸
Charger / Maintainer /
Full Time De-Sulfator-Conditioner
24-Volt @ 1/2/4 Amp
Model 24041
4 A
1 A
Select
Charge Rate
Select
Battery Type
Green = Power ON
ERROR:
Red = Polarity Reversed
/ Battery = less than 6-Volts*
Red (Blinking) = Battery not fully charged -
charger in float-maintenance mode*
Charge - Float
Green (solid) = Charging
Green (blinking) = Float (maintenance)
*See Instruction Manual
PRESSPRESSPRESS
Battery Condition Indication
Power On & Battery Connected
Before Start Charge:
Green = OK - Accepted
Yellow = Weak / Sulfated / Deep Discharge*
After Charge:
Green = Good
Yellow = Sulfated / Weak*
MAINTENANCE
(FLOAT)
AGM
GEL
FLOODED
VDC Electronics, Inc.
800-379-5579 (ET)
www.batteryminders.com
U.S. Patented & Patent Pending
Stop
Restart
Hold for 5 sec. for full reset
For Lead-Acid
Batteries ONLY

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 2
TABLE OF CONTENTS
Safety Instructions...................................................................................................................... 3
Preparing To Charge................................................................................................................... 5
Charger Location......................................................................................................................... 5
DC Connection Precautions....................................................................................................... 6
Qualifying Your Battery: ............................................................................................................. 8
Testing A Filler Cap Or Manifold-type Lead Acid Battery........................................................ 8
Testing With A Hot/Cold Calibrated Hydrometer Tester.......................................................... 10
Testing A Sealed, Agm Or Gelled-type Lead Acid Battery ..................................................... 10
Unit With Call-outs ..................................................................................................................... 12
Simplified Operating Instructions ............................................................................................. 13
LED Indicator Functions ............................................................................................................ 14, 15
Detailed Operation Instructions ................................................................................................ 16
Temperature Sensor ABS-248 (At-the-Battery Sensor) (OPTIONAL)............................... 17, 21 - 24
Maintaining Multiple Batteries................................................................................................... 25
Battery Configurations .............................................................................................................. 26
Troubleshooting - Model 24041 ................................................................................................ 27
Detailed Specifications - VDC Model No. 24041..................................................................... 29 - 33
Charging Profile.......................................................................................................................... 34
For Repair Or Replacement....................................................................................................... 35
Guarantee And Warranty............................................................................................................ 36

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 3
Underwriters Laboratories (UL)
REQUIRED SAFETY INSTRUCTIONS
WARNING
TO REDUCE THE RISK OF FIRE,
ELECTRIC SHOCK, OR INJURY TO
PERSON, OBSERVE THE FOLLOWING:
1. Do not expose charger to rain or snow. It is
designed to operate ONLY INDOORS.
2. USE of any attachment not specifically recom-
mended by the battery charger manufacturer for
use with this exact model of charger may result
in risk of fire & electric shock or injury to person.
3. An extension cord should not be used, unless
absolutely necessary. Use of an improper exten-
sion cord could result in fire or electric shock. If
extension cord must be used be sure:
a. Pins on plug of extension cord are the same
number, size, & shape of plug on charger
b. Extension cord is properly wired and in good
condition.
c. Wire size is enough for AC ampere of charger
as specified below: Length of cord, feet (meters)
25 (7.6), 60 (15.2), 100 (30.5), 150 (45.6) AWG
Size #18.
4. Do not use charger if it received a sharp blow,
been dropped, or damaged.
5. Charger contains no serviceable parts. If it fails
for any reason, return to the address shown within
for a free replacement under warranty.
6. To reduce risk of electric shock, unplug charger
from outlet before attempting any cleaning.
7. WARNING - RISK OF EXPLOSIVE GASES.
WHENEVER YOU WORK NEAR A LEAD ACID
BATTERY IT IS DANGEROUS. BATTERIES
GENERATE EXPLOSIVE GASES DURING
NORMAL BATTERY OPERATION. FOR THIS
REASON, IT IS OF UTMOST IMPORTANCE
THAT EACH TIME BEFORE USING YOUR
CHARGER, YOU MUST READ THIS MANUAL
AND FOLLOW THE INSTRUCTIONS EXACTLY.

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 4
To reduce risk of battery explosion, follow these
instructions and those published by the battery
manufacturer and the manufacturer of any equip-
ment you plan to use in the vicinity of the battery.
Review cautionary markings on the products and
the engine.
8. PERSONAL PRECAUTIONS when working
with or near a lead acid battery.
a. Someone should be able to hear your voice or
close enough to aid you when working near a lead
acid battery.
b. Have fresh water and soap nearby case battery
acid contact skin, clothing, or eyes. Wear com-
plete eye protection and clothing protection. Avoid
touching eyes while working near battery.
c. If battery acid does contact skin or clothing,
wash immediately with soap and water. If acid
entered the eye, immediately ood the eye with
running water for at least 10 minutes and get help
immediately.
d. NEVER smoke or allow a spark of ame near
battery or engine.
e. Be extra cautious to reduce risk of dropping a
metal tool or auto part onto battery. It might spark
or short circuit battery or other electrical part that
may cause an explosion.
f. Remove personal metal items such as rings,
bracelets, necklaces, and watches when work-
ing 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 a severe
burn.
g. Charger is designed to be used for recharging
lead acid batteries ONLY. Never use it to power a
low voltage electrical system, or for attempting to
recharge dry cell batteries that are commonly used
in house holds. These batteries may explode and
cause injury to persons and damage property

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 5
NEVER CHARGE A FROZEN BATTERY OR
ONE AT A TEMPERATURE ABOVE 123° F.
PREPARING TO CHARGE
a. If necessary to remove battery from equipment
to charge. Always remove ground terminal rst.
Turn off all accessories in the vehicle, so as not to
cause an arc.
b. Be sure area around battery is well ventilated
while battery is being charged. Force gas vapors
away by using a piece of non-metallic material as
a fan.
c. Clean battery terminals. Be careful to keep cor-
rosion from contacting eyes.
d. Add distilled water to each cell until battery
acid reaches level specied by the manufacturer.
This helps Purge excessive gas from cells. Do not
overll. For a battery without caps, follow manu-
facturer’s recharging instructions.
e. Study all battery manufacturer’s specic instruc-
tions such as removing cell caps while charging
and recommended charge rates.
f. Determine condition of battery, by referring to
instructions herein, before ever attempting to
charge or desulphate any / all batteries.
CHARGER LOCATION
a. Make sure charger is as far away from battery
as output cables permit.
b. Never place charger directly above battery
being charged; gases from battery will corrode
and damage charger.
c. Never allow battery acid to drip on charger
when reading specic gravity or lling.
d. Do not operate charger in a closed-in area or
restrict ventilation in any way.
e. Do not set battery on top of charger.

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 6
DC CONNECTION PRECAUTIONS
a. Connect and disconnect DC output clips from
battery only after removing charger power cord
from outlet.
b. Attach clips to battery posts and twist or rock
back and forth several times to make good con-
tact. This tends to keep clips from slipping off ter-
minals and reduces risk of sparking.
FOLLOW THESE INSTRUCTIONS WHEN
BATTERY IS INSTALLED IN EQUIPMENT
(VEHICLE, PWC, BOAT, TRACTOR, ETC.)
A SPARK NEAR BATTERY MAY CAUSE
BATTERY TO EXPLODE. TO REDUCE RISK
OF A SPARK NEAR BATTERY:
c. Position DC output cord to reduce risk of dam-
age by hood, door, covers, or moving engine
parts.
d. Stay clear of fan blades, belts, pulleys, and
other parts that can cause injuries.
e. Check polarity of battery posts. POSITIVE
(POS, P,+) usually has a larger diameter than
NEGATIVE -.
f. Determine which post of battery is grounded
(connected) to the chassis of equipment. If nega-
tive post is grounded see Item N. If positive post
is grounded see item P.
N. For negative grounded equipment, connect
POSITIVE (RED) clip from charger to POSITIVE
(POS, P, +) ungrounded post of battery. Connect
NEGATIVE (BLACK) clip to vehicle chassis or
engine block away from battery. Do not connect
clip to carburetor, fuel lines, or metal body parts.
g. For positive ground equipment, con-
nect NEGATIVE (BLACK) clip from charger to
NEGATIVE (NEG, N,) UNGROUNDED POST OF
BATTERY. Connect POSITIVE (RED) CLIP to
chassis or engine block away from battery.

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 7
DO NOT CONNECT CLIP TO CARBURETOR,
FUEL LINES, OR SHEET METAL BODY
PARTS.
Connect to heavy gauge metal part of frame or
engine.
h. When disconnecting charger, disconnect char-
ger from AC outlet, then remove clips from vehicle
chassis, and battery posts.
Operating instructions for charge information.
FOLLOW THESE STEPS WHEN BATTERY IS
OUTSIDE OF VEHICLE OR EQUIPMENT.
A SPARK NEAR THE BATTERY MAY CAUSE
BATTERY EXPLOSION. TO REDUCE RISK OF
A SPARK NEAR BATTERY:
a. Check polarity of battery posts. POSITIVE
(POS,P,+) usually has a large diameter than
NEGATIVE (NEG, N, -) battery post.
b. Connect (RED) charger clip to (POS+) post of
battery.
c. Position yourself and free end of cable as
far away from battery as possible, then connect
NEGATIVE (BLACK) charger clip to free end of
cable.
d. Do not face battery when making final connec-
tions.
e. When disconnecting charger, always do so in
reverse sequence of connecting procedure and
break first connection while as far away from bat-
tery as practical.
DO NOT ATTEMPT TO PERMANENTLY
INSTALL ANY CHARGER NOT SPECIFICALLY
DESIGNED FOR PERMANENT
INSTALLATION, ESPECIALLY IN A WET /
MARINE ENVIRONMENT

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 8
QUALIFYING YOUR BATTERY:
Preliminary Requirements
NOTE: The BatteryMINDer has no electrical out-
put unless it is connected to a healthy battery.
Testing the BatteryMINDer with a volt or an Amp
meter without the unit being connected across a
good battery will result in a false reading. If you
experience any problems, or are not sure of how
to properly use or connect your BatteryMINDer,
please e-mail our technical support at:
[email protected] or call our toll-
free technical support line 800-379-5579 x206
(Eastern Time). Be certain to leave your phone
number with the area code, time zone and
the best time to call.
To gain the best result from your new charger and
to maximize the life and performance of your bat-
teries we strongly recommend you qualify (test)
your batteries before attempting to either charge-
maintain or desulphate them. Remember, even
if you just purchased a “new” battery it may have
been subjected to conditions that have caused
“sulphation” such as high temperature (>=80°).
NOTE: If your battery is new and you are
certain it was not subject to conditions that
could have caused sulphation*, even before
you purchased it, then you can disregard our
recommendations for qualifying / testing your
battery, before using the BatteryMINDer.
* Such as high temperature storage (=/> 80°F)
and/or allowed to self-discharge to 24.8 Volts or
lower.
Testing a Filler Cap or Manifold-type Lead
Acid Battery
1. Carefully remove all 6 caps or both mani-
fold-type covers from your battery.
2. Check the water-liquid electrolyte level. If
the level is low or has ever been below top of
plates, severe lead plate sulphation has taken
place. Significant recharge/reconditioning time
is needed to restore these plates to a condition
where the battery can be expected to function
normally.

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 9
3. Refill each cell with distilled water only to the
liquid level indicator found in each cell. Before
proceeding further you must be thoroughly
familiar with the safety and operating instruc-
tions.
4. Recharge the battery with the BatteryMINDer
to ensure that it is slowly and completely charged
before you determine its condition. Allow battery
to “rest”* overnight for a minimum of 12 hours
before testing with a temperature compensated
hydrometer and/or digital type voltmeter only.
* “RESTED” = a battery that has been as fully
charged as possible, using a 3 stage charger
(model 24041) and left disconnected from
charger or any type load for a minimum of 12
hours.
5. If the BatteryMINDer battery condition LED
lights (YELLOW) within 72 hours (single battery)
or no balls float in one or more cells, your bat-
tery may be too far gone to be fully desulphated.
Reconnect battery to your BatteryMINDer and
press the Maintenance mode button. Allow battery
to remain in maintenance mode for a minimum
of 72 hours, before re-test. Use a hot/cold cali-
brated hydrometer tester for the most accurate
results** (see next page) if you see an increase in
the Specific Gravity (SG) or voltage indicating that
there is an improvement in the battery’s condition,
continue desulphating for an additional 72 hours
and retest the battery. Continue this process until
the SG or voltage readings no longer increase.
Temp. Compensated Hydrom-
eter - meter or 4 ball type
Full Capacity
Percentage
1.270 (4 Balls oating) 100%
1.250 (3 Balls oating) 75%
1.190 (2 Balls oating) 50%
1.150 (1 Balls oating) 25%
1.120 (0 Balls oating)
May denote shorted cell or
battery that has been severely
discharged and may not be
recoverable
0%
Specific Gravity – Capacity
TABLE 1

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 10
Testing with a Hot/Cold Calibrated
Hydrometer Tester
Read the tester instructions carefully for most
accurate readings.
1. When using the tester the first time or after a
long period of non-use, fill the tester with the bat-
tery fluid and let it sit for 1/2 hour or longer. This
will soak the balls in order to give you more accu-
rate readings. Failure to do so will give you false
readings indicating a battery that may not be in as
good a condition as you may have thought.
2. After inserting the tester in a cell, gently tap the
tester several times against the inside wall of each
cell to dislodge air bubbles that will cause more
balls to float than should. Failure to do so will yield
false readings that indicate a battery that is not
fully desulphated or does not qualify for desulpha-
tion.
3. If no balls float in any cell, the cell is shorted.
This means your battery is beyond the point of
being properly recharged or reconditioned-desul-
phated. Dispose of the battery.
If each cell floats three (3) or more balls (or 1250
on gauge-type), your battery can be desulphated-
reconditioned.
4. Always rinse the tester with fresh water after
every use. Failure to do so will cause false read-
ings.
Testing a Sealed, AGM or Gelled-type Lead
Acid Battery
These batteries have no filler caps or manifold-
type covers. Because you cannot gain access to
the interior of your battery you cannot test it with a
hydrometer.
USE A DIGITAL VOLTMETER ONLY:
1. Recharge the battery with the BatteryMINDer
to ensure it is as completely charged as possible,
before you determine its condition. Allow battery
to “rest” (see pg. 9) overnight for a minimum of 12
hours before testing with a digital voltmeter only.

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 11
Failure to test a “rested” (see pg. 9) battery will
cause false readings. Be certain to read and
understand all safety related instructions (pages 3
to 7) before proceeding further.
2. Measure battery’s voltage, without any load
attached. If the voltage is less than 24.8 volts
(Typically 50% of charge) the battery may be
too heavily sulphated to be fully recoverable. If
voltage is 24.8-V or higher full recovery can be
expected, given sufficient time (average 1-2 weeks
for batteries that are heavily sulphated).
3. Connect the BatteryMINDer to the battery.
4. Charge battery to its maximum level. Press
Maintenance-Float (select Battery type) button, if
it does not go into this mode automatically. Allow
battery to remain for a minimum of 72 hours
before retesting. If improvement is seen, continue
until battery voltage reaches full capacity level or
no further increase is seen.
Note: OPTIMA brand “Yellow Top” starter/
deep cycle batteries have a fully charged
“resting” voltage of 26.2 (OCV). Increase
above values accordingly.
OCV - “Rested”
Voltage
Full Capacity
Percentage
25.8 - 26.2 Volts 100%
25.2 - 25.8 Volts 75%
24.8 - 25.2 Volts 50%
24.4 - 24.8 Volts 25%
24.0 - 24.4 Volts 0%
<22 Volts
= shorted
OCV=Open Circuit No Load Voltage
TABLE 2

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 12
1
10
9
8
7
64
5
3
2
11 12
1) Battery clip cordset w/ qwik connect plug (pgs.13, 16)
2) Ring terminal cordset w/ qwik connect plug (pgs. 13, 16)
3) Mounting tabs
4) Input power cordset (pg. 13, 18)
5) Output cord w/ qwik connect plug (pg. 13, 16)
6) Temperature sensor input connector (pg. 13, 17, 21)
7) Charge rate selection button (pg. 13, 17, 18)
8) Battery type selection button (pgs. 13, 17, 18)
9) Stop/Restart selection button (pgs. 13, 17, 18)
10) LED indicators for power, connection, fault, battery
condition, charge status (pgs.13-15, 18–20, 24)
11) 12 Volt Power cordset (Optional)
12) Temperature sensor with cord and ring terminal (pgs. 17,
21 - 24) (Optional)
2 A
9LL=JQ'#(=J¸
Charger / Maintainer /
Full Time De-Sulfator-Conditioner
24-Volt @ 1/2/4 Amp
Model 24041
4 A
1 A
Select
Charge Rate
Select
Battery Type
Green = Power ON
ERROR:
Red = Polarity Reversed
/ Battery = less than 6-Volts*
Red (Blinking) = Battery not fully charged -
charger in float-maintenance mode*
Charge - Float
Green (solid) = Charging
Green (blinking) = Float (maintenance)
*See Instruction Manual
PRESSPRESSPRESS
Battery Condition Indication
Power On & Battery Connected
Before Start Charge:
Green = OK - Accepted
Yellow = Weak / Sulfated / Deep Discharge*
After Charge:
Green = Good
Yellow = Sulfated / Weak*
MAINTENANCE
(FLOAT)
AGM
GEL
FLOODED
VDC Electronics, Inc.
800-379-5579 (ET)
www.batteryminders.com
U.S. Patented & Patent Pending
Stop
Restart
Hold for 5 sec. for full reset
For Lead-Acid
Batteries ONLY

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 13
Simplified Operating Instructions
(Read and thoroughly understand ALL SAFETY Instructions on pages (3-7) and Qualifying Your
Battery pages 8-11, BEFORE proceeding further.
1. Attach a battery connector assembly (supplied) to output cordset of charger, either the clips or ring termi-
nal assembly, - NEVER BOTH at same time.
2. Attach output to battery terminals-RED band =Positive + BLACK band = Negative.
2-a: Attach temperature sensor ABS-248 (if supplied) to battery and then to charger* (if required).
3. Select desired charge rate, 1 A for small batteries, 2 A for medium or 4 A for deeply discharged, large or
multiple batteries. Charger will automatically start in Gel and 1 Amp modes when first plugged into
120 Vac power and has to be unplugged from wall or shut off by pushing Stop/Restart button.Reset to
correct modes, if required.
4. Select Correct battery type: Flooded (wet-filler caps or manifold, Sealed AGM [“dry”] or Sealed Gel)**
5. Plug AC power cord into 120 Vac electrical outlet. Observe REVERSED Polarity LED indicator. If lit RED,
reverse battery connector attachments on battery.
6. Observe Power On - Error Indicator, LED Must be lit GREEN***
7. Observe GREEN LED indicator labeled Charge-Float = Solid when charging, Blinking when maintaining
battery(s). May return to solid GREEN intermittently or if power interruption occurs, to Gel – 2 A modes.
IF IN DOUBT REGARDING ANY OF THE ABOVE, REFER TO FULL INSTRUCTIONS
* See detailed instructions for need and method of properly connecting sensor to battery, pgs. 21 - 24.
** IMPORTANT: If in doubt about what type, consult with seller or manufacturer of battery(s), before going
further. Choosing the wrong setting will cause over or under charge, leading to shortened battery life or
generating potentially hazardous hydrogen gas.
*** See full instructions if not lit GREEN.

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 14
Battery Condition Indication
Battery connected BEFORE full charge:Vb<22V YELLOW
Vb>22V GREEN
If Stop/Restart Button is Pressed during charging mode STOPS CHARGING. PRESS AGAIN TO RESTART.
Battery Sulphation check (AFTER FULL CHARGE & “RESTED”
[See p.9]): Vb<25.6V
Vb>25.6V
YELLOW
GREEN
LED Status - (Power / Error and Charge LEDs) POWER / ERROR CHARGE - FLOAT
GREEN RED GREEN
A.C. power disconnected, battery connected correctly OFF OFF
A.C. power connected, battery connected GREEN OFF
A.C. power connected, battery connected (press Stop/Restart button) GREEN ON
At Soft Start mode, Bulk charge mode, Absorption mode GREEN ON
In Sulphate check mode Float charge mode GREEN FLASH
A.C. power connected Reversed Battery Polarity RED ON OFF
A.C. power connected, charger output Clip shorted RED ON OFF
A.C. power connected, battery voltage is less than 3V RED ON OFF
Timed-out when in SoftStart or Bulk mode RED FLASH OFF
Timed-out when in Absorption mode & Forced to Float mode RED FLASH FLASH
Battery Fault / Battery Weak RED FLASH OFF
LED INDICATOR FUNCTIONS -- Tables 3 (top) and 4 A&B (bottom)

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 15
LED INDICATOR FUNCTIONS
LED indicators refer to charger label at right
TABLE 6
GREEN GREEN GREEN
GEL AGM FLOODED
GEL ON OFF OFF
AGM OFF ON OFF
FLOODED OFF OFF ON
GREEN GREEN GREEN
1A 2A 4A
1A ON OFF OFF
2A OFF ON OFF
4A OFF OFF ON
TABLE 5
2 A
9LL=JQ'#(=J¸
Charger / Maintainer /
Full Time De-Sulfator-Conditioner
24-Volt @ 1/2/4 Amp
Model 24041
4 A
1 A
Select
Charge Rate
Select
Battery Type
Green = Power ON
ERROR:
Red = Polarity Reversed
/ Battery = less than 6-Volts*
Red (Blinking) = Battery not fully charged -
charger in float-maintenance mode*
Charge - Float
Green (solid) = Charging
Green (blinking) = Float (maintenance)
*See Instruction Manual
PRESSPRESSPRESS
Battery Condition Indication
Power On & Battery Connected
Before Start Charge:
Green = OK - Accepted
Yellow = Weak / Sulfated / Deep Discharge*
After Charge:
Green = Good
Yellow = Sulfated / Weak*
MAINTENANCE
(FLOAT)
AGM
GEL
FLOODED
VDC Electronics, Inc.
800-379-5579 (ET)
www.batteryminders.com
U.S. Patented & Patent Pending
Stop
Restart
Hold for 5 sec. for full reset
For Lead-Acid
Batteries ONLY

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 16
Detailed Operation Instructions Model 24041
After carefully reading and understanding the
Safety Instructions contained in this manual
(pages 3 to 7) and having evaluated your battery
as described in Qualifying Your Battery (pages 8
to 10) you are properly prepared to begin using
your charger.
1. Attach output cord of charger to either the
Battery Clip(s) Assembly (BCA) (supplied) or the
Ring Terminal Assembly (RTA) (supplied) depend-
ing on your preference. However never use both
assemblies at the same time for any reason what-
soever.
Never use either of these assemblies on any
other charger or for any other purpose such
as improvised “jumper cables”, etc.
Using the RTA on batteries remaining in their nor-
mal use location (in same place they are regularly
installed will normally prove the safest and most
convenient. If you have several applications you
may wish to purchase additional Ring Terminal
Assemblies (RTA) available from your dealer or
VDC Electronics, Inc. directly.
Note: this assembly contains a 15 Amp auto-
motive type fuse and is replaceable should
for any reason it were to blow. Never replace
this fuse with any type whose rating is higher
than 15 Amps, as seriously harmful results
may occur.
2. Identify the positive and negative posts or
connections on your battery, usually clearly des-
ignated with the polarity markings of + (positive)
and – (negative). If you have previously installed
the RTA referred to in 1. above, you need only to
press the connector plug of the charger’s output
cord into the mating plug of the RTA. Push firmly
and do not leave any space between them.

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 17
Correct polarity and a good connection will be
your reward. Attach the BCA to the proper bat-
tery posts, clamps or screw terminals, depending
on type of battery. ALWAYS connect the nega-
tive (Black) clip to a metal grounding point
(Negative ground installations such as most
modern cars, trucks, boats, RVs, etc.) as far
away from battery as possible for maximum
safety. Never connect to any type of fuel line.
Note: Older vehicles or other devices may be
Positive ground installations requiring differ-
ent connection recommendations. If unfamiliar or
unsure which battery type of grounding system
you have, check with our Tech Support personnel
before proceeding further.
Note: Temperature compensation Sensor
Assembly (Part# ABS-248) (OPTIONAL).See
pages 21 - 24 for full detailed instructions.
3. Determine the type of battery you wish to
charge. When certain press the Select Battery
Type button. The most common is the Flooded
kind, distinguished by removable filler caps (6)
or two (2) manifold covers (Maintenance-Free)
which should not be removed unless specifically
allowed by the battery manufacturer. The second
most popular is the Absorbed Glass Mat (AGM)
sealed-valve regulated type. Lastly is the sealed
valve regulated Gel battery.
Note: If unsure of your battery type, check with the
battery seller, manufacturer or our Tech Support
before proceeding further. The normal (default)
setting of your charger is GEL, as this is the low-
est voltage output and thus the one least likely to
cause your battery to be overcharged, should
you incorrectly select the wrong battery type.
However be aware that using the wrong set-
ting for a particular type battery can dramatically
shorten its life and/or cause potentially explosive
gas to be emitted from the battery.

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 18
4. After selecting battery type, determine the cor-
rect charge rate for your particular battery. Small
batteries (< 10 AH) should be charged at the 1
Amp setting rate. Larger types (10-30 AH) such as
used in motorcycles, PWC, etc. are best charged
at the 2 Amp rate setting. For batteries whose
capacity rating is greater than 30AH or a fast
recharge is needed set charger to the 4 Amp rate.
If unsure or recharge time is not important, always
choose a low setting (1 or 2 Amp).
Note: The safest procedure is to choose
the lowest possible setting when in
doubt or recharge time is not important.
REGARDLESS OF CHARGE RATE, (1, 2, OR
4A), YOUR BATTERYMINDER WILL NEVER
OVERCHARGE WHEN LEFT CONNECTED
FOR LONG PERIODS TO THE BATTERY.
5. After selecting both battery type and charge
rate, plug the unit’s Power cord into a standard –
grounded 120 Vac electrical outlet. The Power ON
LED Indicator will light GREEN. If it does not light
GREEN check the outlet to be sure it is function-
ing. In addition, be sure if outlet is controlled by a
switch, no one will accidentally shut off the power
to the outlet. Check for correct polarity = (no
ERROR RED LED Indicator). If ERROR Indicator is
lit, reverse the charger’s output connections to the
battery.
6. Within 15 seconds, the Charge – Float LED
Indicator will light GREEN. The charger will now
begin charging by first checking the battery to
determine its voltage and ability to accept a
charge. Should the battery not have a normal fully
discharged voltage (21.0-V minimum) the unit will
begin charging in the “Soft-Start” mode to deter-
mine if the battery can be safely charged. If it can-
not, the Power ON – Error LED will flash RED and
charging will be stopped. Battery should be care-
fully checked under a load by a qualified person
before further attempting to charge it.

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 19
Note: If the battery does not have a mini-
mum no load OCV (Open Circuit Voltage)
of 6 volts, the ERROR LED will light
RED and charger will reject battery.
No further effort should be made to charge this bat-
tery with this charger or any charger. Discard this
battery, unless it has just been subjected to a long
period of continuous discharge under a load such
as can occur with leaving lights on or cranking an
engine excessively. Allow such a battery to “Rest”
for several hours (overnight if possible) before
determining if it is defective. Be very suspicious of
any 24-V battery that does not have at least 22-
Volts (OCV) before it is recharged. It may well be
seriously damaged and unsafe for any type of use
or recharge. The unit’s Battery Condition Indication
LED will help you determine if battery is less than 22-
Volts (YELLOW)) or greater than 22-Volts (GREEN)
7. After battery has been fully charged, the GREEN
Charge-Float LED Indicator will begin blinking.
It will continue to blink indefinitely, unless unit is
disconnected from battery or Stop/Restart button
is pressed. Should battery be unable to be fully
charged, the LED will not blink and the RED Error
LED will blink. Battery may not be able to be fully
charged, may be too large or too deeply discharged
to be fully charged in the normal time allowed by
charger. If you are certain battery is not defective,
having read and understood completely all of the
above concerns and conditions, proceed to restart
the charger by pressing and holding the Stop/Restart
button for approx. 5 seconds until all LEDs Flash.
This allows charger to begin charging battery again.

Rev. H-070708 P/N VDC24041-MNL
BatteryMINDer® Model 24041
Page 20
If battery is not defective it should be able to be
fully charged after being restarted. After sufficient
time has lapsed the GREEN charge LED Indicator
will blink confirming when / if battery is now fully
charged.
Note: If attempting to charge more than one
battery at a time it is very likely the char-
ger will need to be restarted as described in
order to completely charge multiple batter-
ies. We do not recommend charging more
than one battery at a time without confirming
the individual condition of each battery and
monitoring the charging and batteries close-
ly. A better solution is to charge each battery
separately using model 24041 BatteryMINDer
and then connect them together, if desired
for long term maintenance-float charging. We
suggest your reading the detailed specifica-
tions on pages 29 - 34, including the addi-
tional LED indicator functions (pgs. 14 - 15)
not already covered above.
After carefully reading these instructions and
Troubleshooting (pgs. 27 - 28) sections, should
you still have questions, please e-mail our techni-
cal support department at:
[email protected].
Allow up to 3 business days for a detailed
response to your questions. Always identify the
model number of the product and revision letter of
this manual contained on this page below. Without
this information we may not be able to assist you
correctly.
If your questions have already been answered in
this manual you can expect a response referring
you back to this manual and the specific page(s).