C&D Technologies RS-1826 Liberty Series 1000 FA Battery - Manual (Page 17)

15
An equalizing charge can be provided when individual cell voltages go
below the minimum value shown in Table 3 or 0.05 Volts below the float
voltage specified in Table 3. Remember to divide the number of cells into unit
voltage to arrive at cell voltage. Presence of a minimum voltage does not
imply a battery is malfunctioning or that it will not provide the necessary
power when called upon.
Note 2: Chargers must be current limited to 25 Amperes per 100-Ampere-
hour battery rating. Higher charging currents could potentially
destroy the battery by overheating that subsequently causes more
current to flow creating a vicious cycle sometimes referred to as
“thermal runaway.”
Note 3: Minimium voltage is the point at which plans should be made to
provide an equalizing charge. Note that the normal equalize voltage
level (initial charge level) will not be effective in VRLA product as the
voltage is not high enough to enable the negative plates to charge.
An equalizing charge of 2.45 volts per cell can be applied to the
string or problem cell/unit for a period not exceeding eight hours.
Consult the C&D TECHNOLOGIES Technical Service Department
for answers to specific questions.
2.2.3 Compensating float voltage for ambient temperature
VRLA batteries should ideally be operated at 77°F (25°C) to obtain optimum
performance and life. If it is necessary to operate outside this temperature it
is advisable to increase the float potential by 3 mV/F° (3.6 mV/C°) for lower
temperatures and lower the float by 3 mV/F° (3.6 mV/C°) for higher tempera-
tures. See Table 2 below.
TABLE 2
RECOMMENDED FLOAT VOLTAGE SETTINGS
AMBIENT TEMPERATURE RANGE
NOTE: The life of a battery will be reduced 50% for each 15°F increase in
operating temperature above 77°F. See Table 3 on page 15.
67°F-87°F* 80°F-100°F 90°F-110°F 100°F-120°F
(19°C-31°C) (27°C-38°C) (32°C-43°C) (38°C-49°C)
VOLTS 2.25 2.24 2.22 2.20
PER +/- +/- +/- +/-
CELL 0.01 0.01 0.01 0.01
Farenheit
Celsius