To Reduce The Risk Of Injury, User Must Read And
Understand Operator’s Manual. Save These Instructions For Future Reference.
260-9475
6V/12V 10A Battery Charger
TABLE OF CONTENTS
Safety Symbols..............................................................................Page 3
Safety Information..........................................................................Page 4
Important Safety Instructions........................................................Page 5
Personal Safety Precautions.........................................................Page 6
Product Overview...........................................................................Page 7
Specification...................................................................................Page 8
Operating Instructions...................................................................Page 9
Maintenance And Care.................................................................Page 11
Error Code.....................................................................................Page 12
Warranty........................................................................................Page 15
Page 3
SAFETY SYMBOLS
Some of the following symbols may be used on your charger. Please study
them and learn their meaning. Proper interpretation of these symbols will allow
better and safer operation of the charger.
Symbol Name Reason/Solution
V Volts Voltage
A Amperes Current
Hz Hertz Frequency
W Watts Power
~ Alternating current Type of current
Direct current Type or characteristic of current
Class II construction Double-insulated construction
Read the operator’s
manual
To reduce the risk of injury, read and
understand the operator’s manual
Wear safety equipment
Operation of the charger can result in
damage to unprotected person
Warning symbol Alerts user to warning message
Electric shock symbol
Connect only to properly grounded
outlets. Replace defective cords or
wire immediately.
Explosive gas symbol
Risk of explosive gases during normal
operation of a lead-acid battery
Page 4
SAFETY INFORMATION
The purpose of safety symbols is to attract our attention to possible dangers. The
safety symbols, and the explanations with them, deserve your careful attention and
understanding. The symbol warnings do not by themselves eliminate any danger.
The instructions and warnings they give are no substitutes for proper accident pre-
vention measures.
Be sure to read and understand all safety instructions in this
manual, including all safety alert symbols, such as “DANGER”, “WARNING” and
“CAUTION” before using this battery charger. Failure to follow all instructions
listed below may result in electric shock, fire and/or serious personal injury.
SYMBOL MEANING
SAFETY ALERT SYMBOL: Indicates DANGER, WARNING or CAUTION.
May be used in conjunction with other symbols or pictographs.
Failure to obey this safety warning WILL result in death or serious
injury to yourself or to others. Always follow the safety precautions to reduce the risk
of fire, electric shock and personal injury.
Failure to obey this safety warning CAN result in death or
serious injury to yourself or to others. Always follow the safety precautions to
reduce the risk of fire, electric shock and personal injury.
Failure to obey this safety warning MAY result in personal
injury to yourself or others, or property damage. Always follow the safety precautions
to reduce the risk of fire, electric shock and personal injury.
Page 5
1. IMPORTANT SAFETY INSTRUCTIONS
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
SAVE THESE INSTRUCTIONS. This
manual contains important safety and
operating instructions.You may need
to refer to these instructions at a later
date.
To reduce risk of injury, charge
lead-acid wet cell, gel or AGM automo-
tive type rechargeable batteries. Other
types of batteries may burst causing
personal injury and property damage.
Do not expose charger to rain or snow.
Use of an attachment not recommend-
ed or sold by the battery charger
manufacturer may result in a risk of
fire, electric shock,or injury to persons.
To reduce risk of damage to electric
plug and cord, pull by plug rather than
cord when disconnecting charger.
Make sure cord is located so that it will
not be stepped on, tripped over, or
otherwise subjected to damage or
stress.
An extension cord should not be used
unless absolutely necessary. Use of
improper extension cord could result
in a risk of fire and electric shock. If an
extension cord must be used, make
sure:
a. The pins on the plug of the extension
cord are the same number, size and
shape as those of the plug on the
charger;
b. That extension cord is properly wired
wired and in good electrical condition;
Do not operate charger with damaged
cord or plug, replace the cord or plug
immediately.
Do not operate charger if it has
received a sharp blow, been dropped,
or otherwise damaged in any way; take
it to a qualified serviceman.
Do not disassemble charger; take it to
a qualified serviceman when service or
repair is required. Incorrect reassem-
bly may result in a risk of electric shock
or fire.
1.11
1.12
To reduce risk of electric shock,
unplug charger form outlet before
attempting any maintenance or clean-
ing. Turning off controls will not reduce
this risk.
RISK OF EXPLOSIVE GASES
1.13
1.14
Prohibit 12V STD, 12V AGM/C, 12V M ,
12V LFP, RECOND, SUPPLY and other
charging modes to charge 6V lead-ac-
id batteries or any lithium batteries;
12V LFP mode is only suitable for 12V
lithium iron phosphate battery, not for
other lithium batteries, it is forbidden
to charge other lithium batteries;
RISK OF EXPLOSIVE GAS MIXTURE-
READ INSTRUCTIONS BEFORE USING
CHARGER.
Connect and disconnect battery leads
only when supply cord is disconnected
For a battery installed in a vehicle first
connect charger output lead to
ungrounded battery post-not connect-
ed to automobile chassis-in accor-
dance with polarity identification and
then opposite polarity lead to chassis
away from battery,do not connect to
carburetor or fuel lines. Disconnect
WORKING IN VICINITY OF A
LEAD-ACID BATTERY IS DANGER-
OUS. BATTERIES GENERATE
EXPLOSIVE GASES DURING
NORMAL BATTERY OPERATION.
FOR THIS REASON IT IS OF
UTMOST IMPORTANCE TO READ
THIS MANUAL AND FOLLOW THE
INSTRUCTIONS EXACTLY EACH
TIME BEFORE USING CHARGER.
To reduce risk of battery explosion,
follow these instructions and those
published by battery manufacturer
and manufacturer of any equipment
you intend to use in vicinity of
battery. Review cautionary marking
on these products and on engine.
a.
b.
1.15
1.16
Page 6
chassis lead first. For battery not
installed in vehicle refer to instruction
Manual.
Do not overcharge battery.
Do not smoke strike a match. or cause
a spark in the vicinity of a battery.
Use in a well-ventilated area.
1.17
1.18
1.19
Someone should be within range of
your voice or close enough to come to
your aid when you work near a lead-ac-
id battery.
Have plenty of fresh water and soap
nearby in case battery acid contacts
skin, clothing, or eyes.
Wear complete eye protection, and
clothing protection. Avoid touching
eyes while working near battery.
If battery acid contacts skin or clothing,
wash immediately with soap and water.
If acid enter eye, immediately flood eye
with running cold water for at least 10
minutes and get medical attention
immediately.
NEVER smoke or allow a spark or flame
in vicinity of battery or engine.
Be extra cautious to reduce risk of
dropping a metal tool onto battery. It
might spark or short circuit battery or
2.1
2.2
2.3
2.4
2.5
2.6
other electrical part that may cause
explosion.
Remove personal metal items such as
rings, bracelets, necklaces, and watch-
es 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 a severe burn.
Use the charger for charging Lead acid,
Gel, Calcium, AGM and EFB batteries. It
is not intended to supply power to a low
voltage electrical system other than in a
starter motor application. Do not use
battery charger for charging dry-cell
batteries that are commonly used with
home appliances. These batteries may
burst and cause injury to persons and
damage to property.
NEVER charge a frozen battery.
2.7
2.8
2.9
DO NOT EXPOSE TO RAIN. RISK OF
ELECTRIC SHOCK DISPOSE OF
BATTERY CHARGER IF CORD
BECOMES DEFECTIVENO USER
REPLACEABLE PARTSCHARGE ONLY
12VLEAD-ACID BATTERIESOTHER
TYPES OF BATTERIES MAY BURST
CAUSING PERSONAL INJURY AND
DAMAGE
Under Supply MODE, Reverse Connec-
tion is Prohibited .
2. PERSONAL SAFETY PRECAUTIONS
Page 7
2.
PRODUCT OVERVIEW
The lead-acid battery charger consists of the following components:
1. Mode Selection Button
2. LCD Display
3. Inlet Power Cable with Plug
4. Battery Terminal Negative (Black) Clamp
5. Battery Terminal Positive (Red) Clamp
6. Outlet Power Cable
7. O-ring with Fuse
1
4
3
2
5
6
7
E
A B C D I
F G H
DISPLAY SYMBOLS
Page 8
3. SPECIFICATION
Charging of a 12 V battery (lead-acid
and gel batteries).
Charging of a 12 V AGM battery / winter
mode (for lead-acid and gel batteries).
Charging of a 12 V battery with a
reduced charging current of 2 A
(lead-acid, AGM and gel batteries).
Charging of a 12 V battery (LiFePO4,
LFP).
Charging voltage in volts / battery
defective (BAD) / fully charged (FUL) /
short circuit at terminals or connected
with the wrong polarity (Err).
Charging of a 6 V battery (AGM, lead-ac-
id and gel batteries).
A
.
B
.
C
.
D
.
E
.
F
.
Restoration of the charging capacity of
discharged lead-acid batteries with an
increased charging voltage or easily
deep-discharged batteries.
Voltage supply / power supply mode
(only suitable for 12 V!).
Charge status of the battery in percent
(1 bar = 20%) and charging process.
Bar is lit = the battery has achieved
the charge status.
Bar in the battery symbol is blinking =
the battery is being changed to the
next charge status.
All the bars are lit = the battery is fully
charged.
G.
H.
I.
•
•
•
Input Voltage 110~120 VAC, 50 -60Hz
End-of-charge Voltage
6 V STD: 7.5V
12 V STD : 14.5 V
12 V AGM/C: 14.8 V
12 V M: 14.4 V
12 V LFP: 14.6 V
RECOND: 16.5 V
Configurable Charging Currents
10 A (12 V STD, AGM/C, LFP)
2 A (6 V STD)
2.5 A (RECOND)
2 A (12 V M)
Battery Capacity (Charging)
35 Ah - 200 Ah (10 A)
7 Ah - 200 Ah (2 A)
Battery Capacity (Maintenance Charging)
4 Ah – 200 Ah
Ambient Temperatures -4°F to +104°F
Protection Class IP65
Safety Features
Short Circuit Protection
Reverse Polarity Protection
Overload Protection
Overcharging Protection
NOTE: No electric vehicles with a
built-in battery can be charged
with the vehicle battery charger.
NOTE: No jump-starting of 6 V or 12 V
batteries is possible.
Page 9
4. OPERATING INSTRUCTIONS
STANDARD SPECIAL
FULLY AUTOMATIC INTELLIGENT 10-STEP CHARGING
In order to enter the mode for the special
charging programs, you must hold the
“Mode” button for around 5 seconds. To
switch between the special modes, you just
need to press the button briefly.
To return to the standard charging
programs, you must hold the “Mode”
button for around 5 seconds or disconnect
the charger from the power.
6 V STD: charging program for AGM,
lead-acid and gel batteries.
RECOND: charging program with an
E
.
F
.
increased end-of-charge voltage and
charging with a constant current. This
mode may only be used to restore the
charging capacity of deep-discharged
12 V lead-acid batteries and must be
supervised. Observe the instructions of
the battery manufacturer.
SUPPLY: for consumers that are usually
operated at the 12 V vehicle connection
socket or to supply voltage to a vehicle
with the battery removed.
ATTENTION: no engine start permissi-
ble!
G
.
In order to switch between the standard
charging programs, just press the “Mode”
button briefly. The charger stores the most
recently selected standard charging
program. This will be automatically select-
ed after the plug has been re-inserted into
the socket.
12 V STD: charging program for
lead-acid and gel batteries. After the
charger is used for the first time, 12 V
STD appears in the display.
12 V AGM/C: charging program for AGM
batteries and recommended charging
program in cold weather (-4°F - +41°F
ambient temperature) for normal
lead-acid batteries.
12 V M: charging program for batteries
with a small capacity (see “SPECIFICA-
TION”) and for the maintenance
charging of all the lead acid batteries.
12 V LFP: charging program for lithium
iron phosphate batteries (LiFePO4 and
LFP).
A
.
B.
C.
D.
Page 10
Step 1. Battery check: after selecting the
charging mode, the charger checks the
status of the battery.
Step 2. Desulphatisation: automatic detec-
tion of sulphated lead batteries. Pulsing
current and voltage dissolves the sulphate
from the battery's lead plates to restore
maximum battery capacity.
Step 3. Refresh: a gentle pre-charge current
is used to charge older or rarely used
batteries, there by reactivating them.
Step 4. Reactivation charge: gentle charging
of the battery with an increased charging
current.
Step 5. Main charge: constant-current charge
with the maximum charging current.
Step 6. Constant voltage charging: Charging
with steady charging voltage to maximize
up to 100% battery capacity.
Step 7. loating Charge: Charge optimiza-
tion that charge with small Constant
current charging .
Step 8. Flat Charge:Charge optimization to
maximize the battery charge, try to reach a
fully charged state.
Step 9. Voltage check analysis: the battery’s
charging status is checked.
Step 10. Maintenance charge: if necessary,
a pulsed maintenance charge takes place,
preventing the battery from discharging.
Any application that deviates from the
proper intended use is prohibited and
potentially dangerous. Damages that are
caused by a misuse or a failure to observe
the proper intended use are not covered by
the guarantee, and the manufacturer is not
liable for such damages.
Please note that our chargers are not
designed for commercial, artisanal or
industrial use. If they are used in the
commercial sector, the guarantee expires.
This 4A is a multi-stage battery charger for
vehicles. It is used for charging and mainte-
nance charging 6 V and 12 V lead batteries
(WET, AGM and gel). It can also charge 12 V
lithium iron phosphate batteries (LiFePO4,
LFP) in the charging program intended for
this. Alternatively, the charger can also be
used in Supply mode as a power supply,
e.g. in order to retain electrical settings
when the battery is disconnected. Howev-
er, the charger is not suitable for charging
lithium-ion batteries.
Discharged batteries can also be regener-
ated, but this depends on the type of
battery. Read the manual carefully before
using the charger for the first time, and
keep it safe.
INTENDED USE
If it’s necessary to remove the battery
from the vehicle to charge it, always
remove the grounded terminal from the
battery first. Make sure all accessories
in the vehicle are off so as not to cause
an arc.
Be sure area around battery is well
ventilated while battery is being charged.
Clean battery terminals. Be careful to
keep corrosion from coming in contact
with eyes.
Add distilled water in each cell until
battery acid reaches level specified by
the battery manufacturer. Do not
overfill! For a battery without removable
cell caps, such as valve regulated lead
acid batteries, refer to the manufactur-
er’s recharging instructions.
PREPARING TO CHARGE
1
.
2
.
3
.
4
.
Study all battery manufacturer’s specif-
ic precautions while charging and
recommended rates of charge.
Determine voltage of battery by
referring to the vehicle’s manual and
make sure the output voltage mode is
correct.
Begin by making sure that your battery
is a 6 V or 12 V battery.
Do not charge any batteries with other
operating voltages!
5
.
6
.
7
.
8
.
To avoid sparks which could cause an
explosion, the mains supply should always
be disconnected before making or break-
ing battery connections. Connect the
battery clips or ring terminals to the battery
in the following order:
CONNECTION TO BATTERY
Page 11
Connect the positive charging lead
(RED) to the positive post of the battery
(marked + / +ve or P).
For vehicles with the battery still
installed: Connect the negative
charging lead (BLACK) to the vehicle
chassis (marked - / -ve or N), well away
from the battery, fuel line, and hot or
moving parts.
For batteries removed from the vehicle:
Connect the negative charging lead
(BLACK) to the negative post of the
battery (marked - / -ve or N).
After connecting the clips, rotate them
slightly so as to remove any dirt or
oxidization, thus ensuring a good
contact.
1
.
2
.
3
.
4
.
First make sure your battery is a 6V or
12V battery. Do not charge batteries
with different operating voltages!
Connect the battery charger to the
power supply .
Select the appropriate charging mode
for your batteries with the "Mode"
button. Refer to Product Overview for a
description of the individual operating
modes.
1
.
2
.
3
.
CHARGING
When the charging process is complete,
“FUL” will appear on the display. If
“FUL V” is blinking, this means the
charger has automatically switched to
maintenance charging.
This battery charger is equipped with an
automatic memory function, i.e. when-
ever AC supply is connected, it starts in
last selected mode.
After the charging process, disconnect
the battery charger from the mains
supply. First remove the clamp from the
negative terminal and then from the
positive terminal.
5
.
6
.
7
.
Store the charger in a clean, dry place.
Wind up the cable when it is not being
used.
Clean the housing and the cable with a
slightly damp cloth.
Clean the terminals with a solution of
water and baking powder to protect
them from corrosion.
1
.
2
.
3
.
4
.
This charger requires only minimal mainte-
nance. As with any device or tool, certain
measures extend the life of the battery
charger.
NOTE: Always make sure that the charger
is disconnected from the mains before you
carry out maintenance and cleaning work.
All other maintenance work should only be
carried out by qualified personnel.
Examine the cables regularly for cracks
or other damages and have them
replaced if applicable.
5
.
A partially charged battery will take less
time to charge than a fully discharged
battery.The approximate charging time for
a battery can be calculated using the
followingequation:
Charging time/h =
E.g.:
CHARGING TIME
Battery capacity in Ah
Amp. (charging current)
Output: 6V 2A
Battery
Capacity(Ah)
6Ah
12Ah
15Ah
21Ah
24Ah
30Ah
3H
6H
7H
10H
12H
15H
Time
(Hours)
Output: 12V 10A
Battery
Capacity(Ah)
30Ah
60Ah
100Ah
120Ah
150Ah
200Ah
3H
6H
10H
12H
15H
20H
Time
(Hours)
5. MAINTENANCE AND CARE
Then, connect the battery charger to the
battery with the correct polarity. If
connected with reverse polarity or
short-circuit at the clamps "Err" will be
lit.
4
.
Page 12
Solution
Err
6. ERROR CODE
Code Possible problemSituation
Terminals connected to
the battery with the
wrong polarity
Battery voltage does
not match the selected
charging mode
Battery is deep discharged
Battery is defective
Use 12V mode to
charge a 6V Battery
Connect them with the
correct polarity
Select the correct
charging program
Leave the battery
connected to the charger
for 12 hours; if the voltage
is captured, the battery
is regenerated
Replace battery
Select the correct
mode for charging
Select a higher charge
rate
Select a lower charge
rate
The charge current is
too low
The charge current is
too high
Battery is not charging
Battery voltage too low
Battery is not charging
Wrong charging Mode
selected
Battery is not full charged
after24-hour charge
The battery voltage rising
fast
BAD
BAD
BAD
Page 13
NOTES
Page 14
NOTES
6V/12V Smart Battery Charger
WARRANTY
90-DAY MONEY BACK GUARANTEE
This MASTERFORCE™ brand battery charger carries our 90-Day Money Back
Guarantee. If you are not completely satisfied with your MASTERFORCE™
brand product for any reason within ninety (90) days from the date of purchase,
return the item with your original receipt to any MENARDS
®
retail store, and we
will provide you a refund – no questions asked.
3-YEAR LIMITED WARRANTY
This MASTERFORCE™ brand battery charger carries our famous No Hassle
3-Year Limited Warranty to the original purchaser. If, during normal use, this MAS-
TERFORCE™ product breaks or fails due to a defect in material or workmanship
within three (3) years from the date of original purchase, simply bring the item
with the original sales receipt back to your nearest MENARDS
®
retail store. At its
discretion, MASTERFORCE™ agrees to ha
ve the item or any defective part(s)
repaired or replaced with the same or similar MASTERFORCE™ product or part
free of charge, within the stated warranty period, when returned by the original
purchaser with original sales receipt. Not withstanding the foregoing, this limited
warranty does not cover any damage that has resulted from abuse or misuse of
the Merchandise. This warranty: (1) excludes expendable parts including but not
limited to blades, brushes, belts, bits, light bulbs, and/or batteries; (2) shall be
void if this product is used for commercial and/or rental purposes; and (3)
does
not cover any losses, injuries to persons/property or costs. This warranty does
give you specific legal rights and you may have other rights, which vary from
state to state. Be careful, battery chargers are dangerous if improperly used or
maintained. Seller’s employees are not qualified to advise you on the use of this
merchandise. Any oral representation(s) made will not be binding on seller or its
employees. The rights under this limited warranty are to the original purchaser
of the merchandise and may not be transferred to any subsequent owner. This
limited warranty is in
lieu of all warranties, expressed or implied including war-
ranties or merchantability and fitness for a particular purpose. Seller shall not be
liable for any special, incidental, or consequential damages. The sole exclusive
remedy against the seller will be for the replacement of any defects as provided
herein, as long as the seller is willing or able to replace this product or is willing
to refund the purchase price as provided above. For insurance purposes, seller
is not allowed to demonstrate any of these products for you.
For questions/comments, technical assistance or repair parts—
Please call toll free at: 1-877-898-3958.
Page 15
© 2024 Menard, Inc., Eau Claire, WI 54703
01/2024
