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www.enersys.com
Publication No. US-MP-OM-001
March 2017
CAUTION
During charge, if the cell/battery temperature exceeds 105˚F (40˚C) stop the charge immediately
and allow the temperature to decrease below 90˚F (32˚C). Failure to follow this warning may result
in severe overcharge and damage to the cell/battery
17.3.1 Equalizing Charge Method
Constant voltage charging is the method for giving an equalizing charge. To perform an
equalizing charge, follow the procedure below:
1. Determine the maximum voltage that may be applied to the system equipment.
2. Divide this voltage by the number of cells connected in a series.
This is the MAXIMUM VOLTS PER CELL to be used for the equalizing charge.
This number should NOT exceed 2.35 VOLTS PER CELL average.
3. Use Table 17.2 to determine the equalize charge time.
The times listed are the number of hours to charge the battery system AFTER the charge
current has been stabilized for three hours.
Stabilization occurs when the current level remains constant for three hours.
TABLE 17.2
CELL
VOLTS
TIME (hours)
AFTER CURRENT STABILIZATION
(3 hours without change)
AT AMBIENT TEMPERATURES FROM
70-90˚F (21-32˚C)
TIME (hours)
AFTER CURRENT STABILIZATION
(3 hours without change)
AT AMBIENT TEMPERATURES FROM
55–69˚F (13–20˚C)
2.32 24 48
2.35 12 24
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