Ambient Temperature, Capacity And Life - Narada 12NDT26 Operation Manual

process and operation circumstance. During operation, the factors that influence the
actual capacity are discharge rate, end voltage, ambient temperature and discharge
time.
2.3 Discharge Rate
If the discharge rate (hour rate) is smaller, the discharge current is larger, and the
discharge time is shorter, then the capacity, which can be discharged, is less. For
example, the discharge current of 3 hours rate is larger than that of 10 hours rate; and
the capacity of 3 hours rate is smaller than that of 10 hours rate.
2.4 End Voltage
The end voltage is the lowest working voltage below which the battery cannot be
discharged any more. Usually the end voltage of Acme range battery is 10.8V per
block. The capacity cannot be discharged more even if the end voltage drops, because
of the characteristics of lead acid battery. The lower end voltage will harm the battery,
especially when the voltage drops to 0V and the battery cannot be recharged in time.
This will shorten life of the battery greatly.
Table 3-1 discharge end voltage at different current
Discharge current (A)
I＜0.2C
0.2C≤I＜0.5C
0.5C≤I＜1.0C
I≥1.0C

3. Ambient Temperature, Capacity and Life

3.1 Relation of Ambient Temperature and Capacity
VRLA batteries can be used in very low or high temperature (below-15° C or above
45° C). Yet all standard data (such as capacity, life, floating voltage) are measured
under standard temperature of 20° C-25° C. The capacity will decrease under lower
temperature as Fig. 3-1:
Operation manual for Acme series V4.2
Discharge end voltage (V/block)
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10.8
10.2
9.30
7.80