Operating Temperature - EnerSys PowerSafe Data Safe Operation & Maintenance Manual

During the equalizing charge, monitor the temperature of a pilot cell. It should not rise above
o o
110 F (43 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
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.
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
1.215
1.250
The room air circulation should be adequate to maintain all cells in the battery within 5
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
Approx. number of cycles
at 80% discharge
Average operating Temp.
107
92
77
62
47
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o
Antimony
1.215
1.250
% of 8-Hr. Capacity
―
o
F
109
105
100
92
83
o
F (38 C), or lower.
Annual Average
Battery Temperature
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77 F (25 C)
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72 F (22 C)
Antimony Flat Plate
300
Life Expectancy in Full Float Application (years)
6
12
20
22
25
Publication No. US-FL-IOM-002 January 2007
Any Cell Temp.
Not To Exceed
for More Than
30 Days Per Year
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90 F (32 C)
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85 F (29 C)
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F (3 C)
Calcium Flat Plate
50
5
10
20
22
25