C&D Technologies RS-1826 Liberty Series 1000 FA Battery - Manual (Page 18)

TABLE 3
CHARGE VOLTAGES FOR
LIBERTY SERIES 1000 FRONT ACCESS CELLS
CHARGE VOLTAGES AT 77°F (25°C)
Note 1:
1 - Applies to average cell voltage. Battery voltage should be set at average cell voltage multiplied by the number
of cells in unit or string. Individual cell voltages may vary by +/- 0.05 Volts from the average.
2 - Charging time will vary due to open circuit stand, temperature and charger voltage available.
3 - If cell temperature is below 60°F (16°C), double the charge time for initial or equalize charge.
Note 2:
All lead-acid batteries lose a certain amount of charge when removed from a constant voltage source charger,
set at a potential that is higher than the open circuit potential of the battery. As the charge is lost, the electro-
chemical process produces lead sulfate in the positive and negative plates of every cell in the battery. If left
uncharged for a significant period of time, the lead sulfate will begin to form large crystals of lead sulfate.
Because of their size, these crystals may be somewhat difficult to reduce (break down) through normal charging
procedures and may inhibit the complete electro chemical process necessary to sustain a healthy lead-acid bat-
tery. Frequently, higher-than-normal charging potentials or even more sophisticated remedial approaches may
be necessary to recover the affected battery. In cases of sever sulfation, replacement may be the only solution.
2.2.4 Over-Voltage
When a charger is improperly set or a panel meter is improperly calibrated battery
over-voltage or under-voltage may result. Higher than normal battery voltage can
damage a battery, significantly shortening its service life. This is especially impor-
tant in valve-regulated product where over-voltage increases gas generation that
could cause pressure build-up within the cell. The excess pressure will cause the
cells to vent the gases generated, causing premature dry out of the battery elec-
trolyte. Even a small increase in over-voltage, beyond what is recommended in
Table 2, increases the corrosion rate of the positive grid element and will contribute
to reduced battery life. To avoid over-voltage, periodically check battery voltage
with a calibrated digital voltmeter. If an over-voltage is recorded, check and read-
just the rectifier and/or panel meter calibration as necessary. Place the battery at
the recommended float charging voltage as soon as possible. Restoring the proper
float voltage will preclude further damage caused by charging at an over-voltage
but it cannot reverse damage that has already been sustained by the battery.
CAUTION
Liberty Series 1000 batteries produce virtually no gas emissions during
normal operation. However, potentially explosive gases may be released
under abnormal operating conditions or initial/equalize charge. Provide
adequate ventilation so hydrogen gas accumulation in the battery area
does not exceed one percent. Do not smoke, use open flame or create
sparks near battery.
Cell Type Open Minimum Float Voltage Initial Charge Typical Charging
Circuit Cell (Vpc) Voltage (Vpc) Time for Initial
(Vpc) Voltage (Vpc) Charge
All Liberty 2.15 2.20 2.26 +/– 0.01 2.33 +/– 0.02 12–16 Hours
Series 1000 ®
FA & FAM
16