background image

 

 

 

WARNING   

 

IF THE BATTERY REMAINS INSTALLED IN THE VEHICLE: 

1. 

DO NOT CONNECT THE CHARGER AC POWER PLUG TO THE 
ELECTRICAL OUTLET UNTIL ALL OTHER CONNECTIONS ARE MADE!

 

2. 

Place both the AC and DC power cords in the best position to avoid 
accidental damage by movable vehicle parts, i.e. hoods, doors, or moving 
engine parts (fan blades, belts, or pulleys).

 

3. 

Check the polarity of the battery posts.  If the positive (pos, p, +) post is 
connected to the vehicle chassis, then the vehicle has a positive ground 
system.  If the negative (neg, n,  -) post is connected to the vehicle 
chassis, then the vehicle has a negative ground system.  Negative ground 
systems are the most common.

 

4.  For negative ground systems, connect the positive (red) alligator clip, or 

ring terminal to the positive battery post.  Then connect the negative 
(black) alligator clip, or ring terminal to the vehicle chassis. Do not make 
the negative charger clip or ring connection to the carburetor, fuel lines, or 
thin, sheet metal parts. Make that connection to  the engine block or a 
heavy gauge metal part of the frame. 

5.  For positive ground systems, connect the negative (black) alligator clip, or 

ring terminal to the negative battery post.  Then connect the positive (red) 
alligator clip, or ring terminal to the vehicle chassis. Do not make the 
positive charger clip or ring connection to the carburetor, fuel lines, or thin, 
sheet metal parts. Make that connection to the engine block or a heavy 
gauge metal part of the frame. 

6.  Connect the AC power plug to the electrical outlet. 
 

ADDITIONAL CHARGER INFORMATION 

 

AUTOMATIC CHARGING AND BATTERY STATUS 
MONITORING: 

The

 

Deltran Battery Tender

 BT-TWIN 800 International 

Battery Chargers are completely automatic and may be left connected to both 
AC power and to the battery that it is charging for long periods of time.  
However, it is prudent to periodically check both the battery and the charger for 
normal operation during these extended charging periods. 

 

The charger output power, voltage, and current all depend on the condition of 
the battery that is being charged.  Deltran Battery Tender

 BT-TWIN 800 

International Battery Chargers have 1 status light that illuminates in two colors 
(one amber, and one green) to indicate both the operating mode of the charger 
and the condition of the battery that is connected to the charger.   

 

The charger operates in one of the 2 primary charge modes:  the bulk mode 
(full charge power, constant current, increasing battery voltage, battery is 0% 
to nearly 100% charged), or the storage / float maintenance mode (low 
constant voltage, minimal charge current, battery is 100% to 103% charged). 

 

When the battery is fully charged, the green status indicator light will turn on 
and the charger will switch to a storage / float maintenance charge mode.  
Deltran Battery Tender

 BT-TWIN 800 International Battery Chargers will 

automatically monitor and maintain the battery at full charge. 

 

 

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 PROTECTION:  

The

 

battery charger can sustain a 

short circuit connection directly across its DC output terminals indefinitely 
without any risk of either electric shock or excessive heat. 

REVERSE POLARITY PROTECTION: 

The

 

battery charger is 

protected internally against any damage due to the DC output leads being 
connected to the opposite polarity battery post.  No damage will result to either 
the battery or the battery charger. 

 

TIME REQUIRED TO CHARGE A BATTERY:

 

The Deltran Battery Tender

 BT-TWIN 800 International Battery Chargers 

charge at a rate of 0.8 Amps (0.8 Amp-Hours per hour).  Therefore, a fully 
discharged 15 Amp-Hour battery will take approximately 20 hours to recharge 
to 100% capacity. Some large automotive or marine, deep cycle batteries may 
take several days to fully recharge. 

 

WORKING WITH A DEAD BATTERY OR A BATTERY WITH A VERY 
LOW VOLTAGE:

 

If you try to charge a dead battery having a voltage below 3 Volts, the Deltran 
Battery Tender

 BT-TWIN 800 International Battery Chargers will not start to 

charge because an internal safety circuit prevents the battery chargers from 
generating any DC output voltage. 

NOTE: 

If a 12 Volt, Lead-Acid battery has an output voltage of less than 9 volts when 
it is at rest, when it is neither being charged nor supplying electrical current to 
an external load, there is a good chance that the battery is defective.  As a 
frame of reference, a fully charged 12-Volt, Lead-Acid battery will have a rest-
state, no-load voltage of approximately 12.9 volts.  A fully discharged 12-Volt, 
Lead-Acid battery will have a rest-state, no-load voltage of approximately 11.4 
volts.  That means that a voltage change of only 1.5 volts represents the full 
range of charge 0% to 100% on a 12-Volt, Lead-Acid battery.  Depending on 
the manufacturer, and the age of the battery, the specific voltages will vary by 
a few tenths of a volt, but the 1.5-volt range will still be a good indicator of the 
battery charge %.

 

 

STATUS INDICATOR LIGHTS: 

The following describes the 

indicator light operation: 

 

Ø 

AMBER LIGHT ON STEADY

  –  Whenever the amber light is on, a 

battery is connected properly and the charger is charging the battery.  The 
amber light will remain on until the battery is fully charged, or the 
connection between the charger and the battery is broken. 

 

Ø 

GREEN LIGHT ON STEADY  

 –  When the green light is on, the charge is 

complete and the battery can be returned to service if necessary. 

 

Ø 

ALTERNATING AMBER & GREEN LIGHTS 

  – This is abnormal and 

most likely indicates that the battery is sulfated, or that there is an 
intermittent or high resistance electrical connection in the DC output. 

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 ...

Reviews: