VDC Electronics BatteryMINDer 12248-AA-S1 User manual

Rev. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
Page 1
INSTRUCTION MANUAL
BatteryMINDer® Model 12248-AA-S1*
Charger / Maintainer /
Desulphator-Conditioner
Rev. F-103007 P/N VDC12248AA-S1-MNL
VDC Electronics, Inc.
147 D Woodbury Rd.
Huntington, NY 11743
www.vdcelectronics.com
[email protected]
READ AND SAVE THESE INSTRUCTIONS
*For use with Aviation Type 12-V Batteries ONLY.
Requires proper installation of Battery Temperature
Sensor (ABS-248 - supplied) and proper battery type
selection.

Rev. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
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-AA (At-the-Battery Sensor).............................................. 17, 21 - 24
Maintaining Multiple Batteries................................................................................................... 25
Battery Configurations .............................................................................................................. 26
Troubleshooting - Model 12248-AA-S1...................................................................................... 27
Detailed Specifications - VDC Model No. 12248-AA-S1......................................................... 29 - 33
Charging Profile.......................................................................................................................... 34
For Repair Or Replacement....................................................................................................... 35
Guarantee And Warranty............................................................................................................ 36

Rev. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
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. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
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. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
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
instructions 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. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
Page 6
DC CONNECTION PRECAUTIONS
Note: Steps to be done in a well-ventilated area
away from aircraft.
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.
c. Position DC output cord to reduce risk of
damage 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. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
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 AIRCRAFT 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 con-
nections.
e. When disconnecting charger, always do so
in reverse sequence of connecting procedure
and break first connection while as far away from
battery as practical. Do not attempt to per-
manently install any charger not specifically
designed for permanent installation, espe-
cially in a wet / marine environment

Rev. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
Page 8
QUALIFYING YOUR BATTERY:
Preliminary Requirements
NOTE: The BatteryMINDer has no electrical
output unless it is connected to a healthy
battery. Testing the BatteryMINDer with a volt
or an Amp meter without the unit being con-
nected 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 sup-
port 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 desulfate them. Remember, even if
you just purchased a “new” battery it may have
been subjected to conditions that have caused
“sulfation” 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 sulfation*, 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 12.4 Volts or
lower.
Testing a Filler Cap Lead Acid Battery
1. Carefully remove all filler caps from your bat-
tery.
2. Check the water-liquid electrolyte level. If
the level is low or has ever been below top of
plates, severe lead plate sulfation 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. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
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 12248-AA-S1) 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 calibrated
hydrometer tester for the most accurate results
(see Table 1) 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%
TABLE 1
Specific Gravity – Capacity

Rev. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
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
battery fluid and let it sit for 1/2 hour or longer.
This will soak the balls in order to give you more
accurate 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
desulphation.
3. If no balls float in any cell, the cell is short-
ed. This means your battery is beyond the point
of being properly recharged or reconditioned-
desulphated. 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
readings.
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) over-
night for a minimum of 12 hours before testing
with a digital voltmeter only.

Rev. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
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 12.4
volts (Typically 50% of charge) the battery may be
too heavily sulphated to be fully recoverable. If
voltage is 12.4-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.
Select type of 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: Do not expect to completely eliminate
sulphate in a few days. Long established sul-
phate will require several weeks or longer to
be fully dissolved. Be patient and you will be
rewarded with a “sulphate-free” battery.
OCV - “Rested”
Voltage
Full Capacity
Percentage
12.9 - 13.1 Volts 100%
12.6 - 12.9 Volts 75%
12.4 - 12.6 Volts 50%
12.2 - 12.4Volts 25%
12.0 - 12.2 Volts 0%
<11 Volts
= shorted
OCV=Open Circuit No Load Voltage
TABLE 2

Rev. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
Page 12
1
10
9
8
7
6
4
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. 17)
7) Charge rate selection button (pgs. 13, 17, 18)
8) Battery type selection button (pgs. 13, 17, 18)
9) Start / reset 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
(pg. 17, 21 - 24) (supplied on 12248-AA-S1)

Rev. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
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
terminal 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 to battery and then to charger*.
3. Press 8A button twice (2x) until LED is lit.
4. Press Aviation button twice (2x) until LED is lit.
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 Battery Connected - Error Indicator, LED Must be lit GREEN.**
7. Observe GREEN LED indicator labeled Charge-Float = Solid when charging, Blinking when main-
taining battery(s). Charger will automatically start.
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.
** See full instructions if not lit GREEN.

Rev. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
Page 14
Battery Condition Indication
Battery connected before charge:Vb<11V YELLOW
Vb>11V GREEN
If pressing Reset Button in the charging stage STOPS CHARGING AND ALLOWS RESET OF ALL SELECTIONS
Battery sulphation checked: Vb<11V (BEFORE CHARGE) YELLOW
Vb>11V GREEN
Battery sulphation checked: Vb<13V (AFTER CHARGE) YELLOW
Vb>13V 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 start 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. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
Page 15
9LL=JQ'#(=J¸
Charger / Maintainer /
Full Time De-Sulfator - Conditioner
Model 12248-AA-S1 12-Volt @ 8 Amp
8 A
Until
8A Lit Until Aviation Lit
Charge - Float
Green (solid) = Charging
Green (blinking) = Float (maintenance)
*See Instruction Manual
PRESSPRESSPRESS
MAINTENANCE
MODE ONLY
(HOLD 3 SEC.)
Start / Reset
/ Stop
U.S. Patents: 5783929 & 6078166
VDC Electronics, Inc.
800-379-5579 (ET)
www.vdcelectronics.com
AVIATION
AVIATION-CALIBRATED
AIRCRAFT BATTERY ONLY
FOR LEAD-ACID
GA BATTERY ONLY
Green = Power ON
ERROR:
Red = Polarity Reversed
/ Battery = less than 3-Volts*
Red (Blinking) = Battery not fully charged -
charger in float-maintenance mode*
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*
Hold for 5 sec. for full reset
GREEN
8A
ON
LED INDICATOR FUNCTIONS
LED indicators refer to charger label at right
TABLE 5
TABLE 6
RED
AVIATION
ON

Rev. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
Page 16
Detailed Operation Instructions
Model 12248-AA-S1
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
11) 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. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
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 negative
(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). See pages 21 - 24
for full detailed instructions.
3. Press 8A Button twice (2x) until LED lit.
4. Press “Until Aviation Lit” button until LED lights.
5. Plug the unit’s Power cord into a standard
– grounded 120 Vac electrical outlet. The Battery
Connected LED Indicator will light GREEN. If it
does not light GREEN check the outlet to be
sure it is functioning. In addition, be sure if outlet
is controlled by a switch, no one will accidentally
shut off the power to the outlet. Check for cor-
rect polarity = (no ERROR RED LED Indicator). If
ERROR Indicator is lit, reverse the charger’s out-
put connections to the battery.

Rev. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
Page 18
6. Press the Start / Reset /Stop button. 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 (10.5-V
minimum) the unit will begin charging in the “Soft-
Start” mode to determine if the battery can be
safely charged. If it cannot, the Battery Connected
– Error LED will flash RED and charging will be
stopped. Battery should be carefully checked
under a load by a qualified person before further
attempting to charge it.

Rev. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
Page 19
Note: If the battery does not have a mini-
mum no load OCV (Open Circuit Voltage)
of 3 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 12-V battery that does not have at least 11-
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 11-
Volts (YELLOW)) or greater than 11-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 discon-
nected from battery or Start / Reset 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 con-
cerns and conditions, proceed to restart the char-
ger by pressing and holding the Start/Reset/Stop
button for approx. 5 seconds until all LEDs Flash.
This allows charger to begin charging battery again.

Rev. F-103007 P/N VDC12248AA-S1-MNL
BatteryMINDer® Model 12248-AA-S1
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 confirm-
ing the individual condition of each battery
and monitoring the charging and batteries
closely. A better solution is to charge each
battery separately using your model 12248-
AA-S1 BatteryMINDer and then connect them
together, if desired for long term mainte-
nance-float charging. We suggest your read-
ing the detailed specifications on pages (21
- 26), including the additional 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).