25
CHECK OF BATTERY
The condition of the battery should be checked every third
month. The specific gravity of a fully charged battery depends
on the ambient temperature.
The table below indicates the relationship between the
specific gravity and the temperature.
Temperature Spec.Gravity Temperature Spec. Gravity
0°
°°
° C
1.287
-10°
°°
° C
1,259
10°
°°
° " 1,280 -20°
°°
° " 1,248
20°
°°
° "
1,273
-30°
°°
° "
1,241
25°
°°
° "
1,270
30°
°°
° "
1,267
35°
°°
° "
1,263
The specific gravity of the electrolyte increases/decreases by
0,0007 every 1 degree above/below 25°C.
The electrolyte level should be 6-9 mm above the separators.
Top up with distilled water if necessary.
NOTE: In cold weather distilled water should be added only
before charging the battery.
Keep the battery terminals clean and coat with petroleum
jelly.
If the battery is of the maintenance free type without filler
plugs, the condition may be checked by means of an accurate
digital voltmeter.
The battery should be allowed to stabilise for 6-8 hours with
the leads disconnected before measuring the voltage.
The average specific gravity can be calculated according to
following formula:
MEASURED VOLTAGE
SPECIFIC GRAVITY = NUMBER OF CELLS - 0,84
Example:
Measured voltage: 12.65 V
Number of cells : 6
12,65
Specific gravity = 6 -0,84 = 1,27
CAUTION
The electrolyte is sulphuric acid and should be handled with
great care. Always wear goggles when servicing the battery.
If battery acid accidentally is splashed in the eyes, wash
with clean water and obtain qualified medical assistance
immediately.
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