OPzV Battery Operation Manual
5
any more or it will harm the battery. Usually the 10hr rate end voltage of battery is 1.80V/cell, and
the 20hr rate end voltage of battery is 1.80V/cell.The batteries are not able to discharge more
capacity even if the end voltage is lower because of characteristics of lead acid battery, yet the low
end voltage makes great harm to the battery. It will greatly shorten batteries’ life especially to
discharge the battery to 0V while not to recharge in time. Thus the end voltage should not be lower
than what is described in table 3-2, or it will cause over-discharge and make battery failure after
several times of over-discharge.
Table 3-2 Discharge End-voltage
Discharge Current
（
A
）
Discharge End Voltage (V/cell)
I <0.08C
≥
1.85
0.08C
≤
I <0.2C
≥
1.80
0.2C
≤
I <0.6C
≥
1.75
0.6C
≤
I <1.0C
≥
1.70
1C
≤
I <2C
≥
1.60
3 Temperature
3.1 Available Capacity vs. Ambient Temperature
Temperature affects capacity of the battery. Fig. 3-1 is the available capacity curve vs.
ambient temperature. If the temperature drops, the capacity will decrease, for example, the
capacity will decrease to 80% of rated capacity if temperature decreases from 25
℃
to 10
℃
; and
too low temperature will cause battery long term insufficient charged, also will cause no discharge
and negative plates sulfate.
Though VRLA battery can be operated at -20
℃
, the standard data is the test result at 25
℃
.
The capacity will increase when temperature rises. For example the capacity will increase to
102% of rated capacity if temperature increases from 25
℃
to 50
℃
. But the capacity increase very
little when temperature goes on increasing, and it will stop increase at last. However, it will quicken
plates’ corrosion and water loss if temperature rises, and shorten battery’s life.
