Page 34
www.enersys.com Publication No. US-FL-IOM-002 January 2007
9.5 Operating Temperature
Normal battery life may be expected only when batteries are operated under the following
temperature conditions:
TABLE 9.4 – RECOMMENDED BATTERY TEMPERATURES
Nominal Specific Gravity
Calcium Antimony
Annual Average
Battery Temperature
Any Cell Temp.
Not To Exceed
for More Than
30 Days Per Year
1.215
1.250
1.215
1.250
77
o
F (25
o
C)
72
o
F (22
o
C)
90
o
F (32
o
C)
85
o
F (29
o
C)
The room air circulation should be adequate to maintain all cells in the battery within 5
o
F (3
o
C)
of each other.
High temperature increases realized capacity but decreases life expectancy, while low
temperatures decrease capacity, but may not affect life expectancy. Table 9.5 shows the
relationship between average temperature and battery life.
TABLE 9.5 – RELATIONSHIP OF TEMPERATURE TO BATTERY LIFE
% of 8-Hr. Capacity Antimony Flat Plate Calcium Flat Plate
Approx. number of cycles
at 80% discharge
― 300 50
Average operating Temp.
o
F Life Expectancy in Full Float Application (years)
107 109 6 5
92 105 12 10
77 100 20 20
62 92 22 22
47 83 25 25
During the equalizing charge, monitor the temperature of a pilot cell. It should not rise above
110
o
F (43
o
C). If it does, the equalizing voltage should be lowered to 2.20 or 2.25 VPC until
the cells cool down to a temperature of 100
o
F (38
o
C), or lower.
Failure to follow this warning may result in severe overcharge and damage
to the cell/battery. At this point, the equalizing charge may be resumed.
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