Specifications

54
21 Checking electrolyte level
For conventional batteries it is required
to check the electrolyte level regularly.
Remove vent caps (taking care no spark
or open flame is nearby) and inspect the
level. Fluid should be 10 to 15 mm (3/8” to
5/8”) above top of all plates. If necessary
top up with distilled water. Replace vent
caps and charge the battery for 15 min-
utes at 15 - 25 Amps to mix electrolyte.
22 Checking specific gravity
Measure the electrolyte specific gravity
of the individual cells with a commer-
cial hydrometer. The hydrometer reading
(see table) indicates the state of charge.
Hydrometer reading of all cells should be
at least 1.200 and show less than 0.050
between high and low. If not, recharge or
replace battery. During checking the tem-
perature of the electrolyte should prefer-
ably be 20°C (68°F).
The temperature of the electrolyte dur-
ing checking should be preferably 20°C
(68°F).
Measuring the specific gravity shortly after
water has been added results in an incor-
rect measurement. First charge the battery
to mix the added water thoroughly.
Battery, cables and connections
Every 100 operating hours.
4 Maintenance
VD00119 VD00120
Conventional batteries Conventional batteries
Specific
gravity
State of
charge
1.280 100%
1.200 50% recharge
1.120 10%
recharge
immediately