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12 Volt 

Models: 

800 Milliamp, Dual Output

 

 

IMPORTANT SAFETY INSTRUCTIONS 

SAVE THESE INSTRUCTIONS:

 

 

This manual contains 

important safety and operating instructions for the Deltran Battery 
Tender®, BT-TWIN 800, Dual Output 12 Volt 800 Milliamp, 
International  Battery Chargers.  

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, and other 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     

Always use adequate eye protection when working around 
batteries and battery charging equipment.

 

WARNING     

Do not operate the battery charger with damaged AC power cords 
or plugs or DC output cords or accessories - Replace damaged 
power cords & accessories immediately.  

Deltran Battery Tender

 

BT-TWIN 800 

Dual Output 

International Battery Chargers 

 

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 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. 

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. 

EXCESSIVE MOISTURE:

  Do not expose the Deltran Battery Tender

 BT-

TWIN 800 International Battery Chargers to rain or snow, or excessive 
moisture of any kind, including high, near  100% condensing humidity 
environments. 

CHARGER ATTACHMENTS:  

Do not use attachments that are not 

recommended or sold by Deltran or its affiliates.  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. 

 

Summary of Contents for Battery Tender BT-TWIN 800

Page 1: ...e operation such as not removing cell caps while charging and the recommended rates of charge charger output current CAUTION 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 CHARGER VOLTAGE COMPATIBILITY NEVER use a...

Page 2: ... shock hazard a fire or even an explosion 5 Remove all 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 circuited current high enough to weld a metal ring or other piece of jewelry causing a severe burn 6 Use the Deltran Battery Tender BT TWIN 800 International Battery Chargers for charging lead acid ba...

Page 3: ...ery Chargers will automatically monitor and maintain the battery at full charge 6 SPECIAL FEATURES Deltran Battery Tender BT TWIN 800 International Battery Chargers have the following special features SPARKPROOF The battery charger DC output leads either ring terminals or alligator clips must be connected to a battery before an output voltage is developed by the battery charger SHORT CIRCUIT PROTE...

Page 4: ...ially 4 THE AMBER LIGHT COMES ON AGAIN AFTER THE GREEN LIGHT CAME ON There may be another appliance drawing electric power from the battery causing its voltage to drop below the reset level The battery charger then goes back into full charge mode Also the charger connections at the battery may be intermittent or the battery may be defective 8 SPECIFICATION SUMMARY Technical Specifications BT TWIN ...

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