DRAPER 70807 12V Battery Starter Charger, 20A

User Manual - Page 13

For 70807.

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8. OPERATION AND USE
8.3 BATTERY INFORMATION
Typical readings.

Engine
Capacity
<1300cc
5 - 15Ah 15 - 30Ah 35 - 45Ah - 60 - 110Ah
>1300cc - - 45 - 65Ah 45 - 65Ah 60 - 110Ah
Diesel - - 60 - 90Ah 60 - 90Ah 60 - 110Ah
8.4 CHARGING TIMES
The charging time depends on the batteries charge condition. 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 following equation:-
Capacity in Ah (battery)
Charging time/hours =
Charger output (Amps)
For example, a 45Ah battery would require approximately 11 hours to charge from a 4.2A battery
charger.
The above table is to give an average charge time.
If the charger you are using is an automatic or smart charger then it will automatically turn off or
revert to “float” charge status to maintain the battery in its fully charged state.
8.5 USING THE ENGINE START FUNCTION
1. Setup the battery charger and connect to the battery as the "8.2 charging the battery" section.
2. Press the engine start button.
3. The engine start icon will be shown on the screen. The vehicle is ready to start.
4. Crank the engine, typically in 3 to 5 second bursts. The digital display shows "5sec" indicating
a 5-second countdown.
Note: Pls do connect the battery first, then press Engine Start button, otherwise, it won’t work, and
the LCD screen will display “LO” with sound alarm.
Important: the function requires a resting /cooling period between attempts, wait 4 to 5 minutes
before a second attempt at starting the engine, if needed.
When disconnecting charger, disconnect AC cord, remove clamp from vehicle chassis, and then
remove clamp from battery terminal.
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