1. BATTERY AND CHARGER
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1.1 GENERAL DESCRIPTION
1.1.1 BATTERY
The battery unit consists of twenty-four 2-volt battery cells connected in series. Figure 1.1 shows its
construction.
(1) Battery care
The most important point in battery care is to
prevent overdischarge. The deeper the battery
discharges, the shorter its life becomes (See Fig. 1.2).
The approximate depth of discharge can be known
by measuring the specic gravity of the electrolyte
(See Fig. 1.3)
Check the level of electrolyte every ten days.
Add distilled water if the level is found lower than
the specied level before charging the battery.
Fig. 1.2
Relation Between Depth of Discharge
and Service Life (Example)
Service life
Cycles of
charge and
discharge
Depth of discharge (%)
BATTERY CELL WITH
ELECTROLYTE LEVEL SENSOR
LOCK PIN
ELECTROLYTE
LEVEL INDICATOR
Fig. 1.1
Battery Unit
Note: The sketch shows a 48-volt battery unit. The 72-volt battery unit has 36 battery cells.
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