TM 9-6140-200-14
c. The constant voltage method is the most suitable for charging sealed
lead-acid batteries. Though not as good, constant current charging
method can be used. This method must remain an exception, and be
used only when no constant voltage charging devices are available.
d. In constant voltage charging, the charger maintains a constant applied
voltage to the battery.
5-6.2 Recharging.
a. Recharging is necessary to bring sealed lead-acid batteries which has stood
for 12 months to a usable state of charge.
b. Charging Procedures for GEL Battery (NBB248), Do not charge more than
one battery at a time.
NOTE
The best way to determine how fully charged a
GEL battery is by a simple voltage reading on the
rested battery.
(1) The approximate relation of battery state of charge to battery open
circuit voltage (OCV) is shown below.
State of Charge
Open Circuit Voltage
100%
12.9 volts
75%
12.7 volts
50%
12.4 volts
25%
12.1 volts
5-7
