Battery Tender Junior Instruction Manual

1 

12 & 6 Volt 

Models:

750 Milliamp & 1.25 Amp 

& 

8 Volt Model 1.25 Amp 

IMPORTANT SAFETY INSTRUCTIONS 

SAVE THESE INSTRUCTIONS: 

This manual contains 

important safety and operating instructions for BATTERY TENDER® 

CHARGERS, both the 12 & 6 Volt 750 Milliamp BT JUNIOR and 12, 6, 

& 8 Volt 1.25 Amp BT PLUS models. CAREFULLY READ THESE 

INSTRUCTIONS BEFORE USING THE BATTERY CHARGER. 

WARNING AND CAUTION LABEL DEFINITIONS: 

WARNING     

WARNING indicates a potentially hazardous situation, which, if 

not avoided, could result in serious injury or death.

CAUTION     

CAUTION indicates a potentially hazardous situation, which, if not 

avoided, may result in minor or moderate injury.

CAUTION     

CAUTION used without the safety alert symbol indicates a 

potentially hazardous situation that if not avoided, may result in 

property damage. 

GENERAL PRECAUTIONS 

WARNING     

Battery posts, terminals and related accessories contain lead and 

lead components, chemicals known to the State of California to 

cause cancer and birth defects or other reproductive harm. 

Always wash your hands after handling these devices.  

WARNING     

Do not operate the battery charger with damaged AC power cords 

or plugs or DC output cords or accessories - Replace accessories 

immediately.  Since neither the AC power cord nor the DC output 

cord can be replaced, if either cord is damaged the battery 

charger should be scrapped. 

Battery Tender® JUNIOR & 

Battery Tender® PLUS 

Battery Chargers

392-0154-R0

2 

CAUTION     

WORKING WITH LEAD ACID BATTERIES AND BATTERY CHARGERS:  

All lead acid batteries have the potential to emit gasses that may combine into 

a combustible or explosive mixture.  In many cases, it is possible that lead acid 

batteries will emit these gasses during normal discharge and charging 

operations.  Because of this potential danger, it is important that you follow the 

precautions recommended by both the battery and battery charger 

manufacturers before using either one. 

USING MANUALS:  Study all of the battery manufacturer's precautions and 

specific recommendations for safe operation such as not removing cell caps 

while charging and the recommended rates of charge (charger output current). 

CAUTION     

CHARGER VOLTAGE COMPATIBILITY:  NEVER use a battery charger 

unless the battery voltage matches the output voltage rating of the charger. 

For example, do not use a 12-volt charger with a 6-volt battery and vice-versa.

CHARGER LOCATION:  LOCATE the charger as far away from the battery as 

is allowed by the length of the output cable harness.  NEVER set the charger 

above the battery.  NEVER set the charger on a surface constructed from 

combustible material.  NEVER place the battery, the charger, or any of the 

electrical connections between them in an area that is likely to become wet. 

EXCESSIVE MOISTURE:  Do not expose the battery charger or any of its 

electrical connections (either AC or DC) to rain, snow, or extremely high, 

condensing humidity. 

CHARGER ATTACHMENTS:  Do not use attachments that are not 

recommended or sold by the charger manufacturer.  To do otherwise may 

result in the risk of electric shock, fire, or possibly some other unforeseen 

potential personal injury situations. 

HANDLING POWER CORDS:  When handling electric power cords, always 

pull by the plug rather than by the cord.  This will reduce the risk of damage to 

both the plug and cord, and it will minimize the likelihood of electric shock 

resulting from that damage. 

LOCATION OF POWER CORDS:  Make sure all electric power cords are 

located so that they cannot be stepped on, tripped over, or otherwise 

subjected to damage or stress. 

MONITORING SEALED & NON-SEALED BATTERIES:  When leaving a 

battery charger connected to either a sealed (AGM or GEL) or non-sealed 

(flooded battery) for extended periods of time (weeks, months, etc.), 

periodically check the battery to see if it is unusually warm.  This is an 

indication that the battery may have a weak cell and that it could go into a 

thermal runaway condition.  If the battery releases an excessive amount of gas 

or if the battery gets hotter than 130

°F (55°C) during charging, disconnect the 

charger and allow the battery to cool.  Overheating may result in plate 

distortion, internal shorting, drying out or other damage.  For flooded batteries, 

also check individual cell fluid levels against manufacturer's recommendations 

for safe operation.