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Special Charges

The following type of special charges is usually required for proper maintenance of secondary batteries.

1.    Boosting Charge:

Though batteries are usually of sufficient capacity to work for the whole day without requiring ant intermediate charge during the day. But in some cases such as in battery operates vehicles, however, the batteries may require an extra charge known as “boosting charge “ in the middle of the day.

The current for this boosting charge is usually determined by an empirical rule according to which the boosting charge current in amperes is numerically equal to battery discharge in ampere-hours up to that time when boosting charges to be given. For example for an 80 ampere-hours battery when discharged to the extent of 25 ampere-hours, the boosting charge current will be 25 amperes. Due to this charging current there is no gassing.

2.    Equalizing Charge:

The equalizing charge is a low rate charging and is given to the cells to ensure that every cell is brought into a fully charged condition at regular intervals. This charge is given until the voltage and specific gravity of the electrolyte ramins constant for three successive hourly readings. This keeps the cell healthy for a longer period of time. The usual practice of giving equalizing charge is as follows :

(i)    For batteries subjected to “trickle charge”-not required.
(ii)    For “floating” or idle batteries- once a month.
(iii)    For batteries charged less frequently-once a fortnight.
(iv)    For batteries charged every day-once a week.

Trickle Charge. The trickle charge is extremely a law rate charge and is applied to stand-by batteries for compensating the open circuit losses. The charge current should be of such magnitude that when it is allowed to flow continuously through the fully charged batteries, specific gravity remains constant at the specified value.

The batteries subjected to “trickle charge” can maintained always in a fully charged condition for many years. The life of a battery also abases.

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