Datasheet

RECOMMENDED TEMPERATURE RANGE
1. Operating Temperature during Charge
Charge efficiency highly depends on operating tem-
perature. Due to the increasing evolution of oxygen at
the positive electrode charge efficiency decreases at
higher temperatures.
At low temperatures charge efficiency is excellent. As
the oxygen recombination process is slowed down at
low temperature, a certain rise in internal cell pressure
may occur depending on charge rate. Therefore the
following ranges of operating temperatures are recom-
mended.
■
Standard charge: 0 to +65°C
■
Accelerated charge: +10 to +45°C
■
Fast charge: +10 to +45°C
■
Trickle charge: +10 to +35°C
2. Operating Temperature during Discharge
The recommended temperature range is -20 to +60°C
for discharge. Maximum capacity is obtained at an
ambient temperature of about +24°C.
There is a slight decrease of capacity at higher tem-
peratures and also at low temperatures. This reduction
in capacity is more pronounced at low temperatures
and high discharge rates.
3. Storage and Self-Discharge
The recommended temperature range for long-term
storage is -20 to +35°C
1)
. Due to the self-discharge
of the cells the stored capacity decreases over time.
Self-discharge is dependent on temperature. The
higher the temperature the greater the self-discharge
over time. Long-term storage has no permanent effect
on capacity, if recharging is done at least once a year.
Please observe that batteries are faster discharged
through leak-currents as soon as they are electrically
connected with a device.
1)
The relative humidity should be around 50%.
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