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5.3 Checking the battery
The battery is fully charged when the battery voltage and the acid density are not
•
changed between two measurements made with an interval of two hours.
Check at least once a week at the end of the charging that the battery has a cor
-
•
rect acid density (1,26-1,28 kg/l at 20°C).
Note:
Regular discharges to an acid density below 1,13 kg/l shorten the battery life,
and the acid density must never be less than 1,10 kg/l.
Method A
Check the acid density in the six battery cells with an acidometer.
Check each cell - max. difference between each cell 0.04 kg/l.
Method B
To measure the voltage, use a digital voltmeter (DC) on the battery poles. The truck
must not have been in use for the previous 30 minutes.
DENSITY
1.28 kg/l
Fully charged
1.18 kg/l
50% discharged
1.12 kg/l
80% discharged
1.10 kg/l
Discharged
VOLTAGE
Approx. 12.7 V Fully charged
Approx. 12.1 V 50% discharged
Approx. 11.9 V 70% discharged
Approx. 11.8 V 80% discharged
Approx. 11.6 V Discharged
5.2 Warnings and information on battery
The charging of tubular cell and semi-trak batteries gives off
gases that can be explosive:
- Use of naked flames near the batteries should be avoided
- Charging should therefore be performed in a ventilated room
- The battery cover has to be open to ensure a good ventilation
of the battery.
At temperatures around the freezing point, battery capacity is
reduced by 30%.
