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Normal charge
Charge the discharged batteries as quickly as possible. The temperature of electrolyte before
starting the charging operation shall preferably be below 45
charge should be maintained at no higher than 55 C. (Under any unavoidable situations, it should
never be above 55 C). Methods of charging varies in precise meaning with the types of chargers
used. A standard charging method is described hereunder. (If a special method is mentioned to
be adopted, follow that instruction).
a
a
.
C
C
harging by modified constant voltage automatic charger
There is almost automatic charger today which complete the charging just only connecting the
plug between battery and charger without outer operating timer but if your charger has it, after
setting the timer for 3-4 hours and turn on the charger and the charger is left as it is, then the
charge will be made automatically. In principle, regardless of the amount of previous discharge,
it is not required to alter the setting of timer time. The recommendable current value of this type
of charger is "5 hour rate current
hour rate current
automatically.
b.
C
C
harging by constant current constant voltage automatic charger
After a lapse of specified charging time after the switch is turned on, the charge will be
completed by turning off the switch. The charging time can be calculated by the following
formula.
Charging time =
When the amount of previous discharge is not known, use the 5 hour rate rated capacity of the
batteries. At immediately after charging, the charge current is allowed up to 3 times 5 hour rate
current. For charger provided with a timer, the charge will terminate automatically if the timer is
set at the specified time according to the operation manual.
Equalizing charge
When large number of cells are used in a set of battery, the voltage and specific gravity of
respective cells tend to become unequal, resulting in necessity of charging all the cells at an
appropriate time in order to equalize them. This is called equalizing charge. Normally the
equalizing charge should be carried out once every month. The methods are in normal type
charger, extend the charge for 5 more hours after full charge at the final stage current, and in
automatic charger which are in most cases provided with timer, extend the time setting for 3-6
more hours.
Water replenishment
Only the water content of electrolyte is decreased due to electrolysis of water during charge and
natural evaporation. If a battery used with the electrolyte decreased excessively, plates will
deteriorate resulting in markedly shortening of battery life. Be sure to check the electrolyte level
once every week. If the electrolyte level is lowered, replenish distilled water up to the specified
level. In this case, never attempt to replenish sulfuric acid or tap water. Use only distilled water
for battery replenishment. If the amount of water required for weekly addition to a unit cell for
100AH of battery capacity is in excess of 45cc, it is assumed that the cell is receiving overcharge.
Accordingly, be sure to reduce slightly the daily charge amount. Under the normal conditions, the
addition of water per week is 45cc or less. Incidentally, water replenishment should be made
before charging to the contend of minimum level.
1.0~1.5" at the start of charging, and at the final stage it is "5
0.15~0.25". Normally the charge is terminated within 8~12 hours
Amount of previous discharge(AH)
Capacity of charger(A)
7-8
C, and the temperature during the
+ 2~3(H)
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