Alpha Technologies Industrial Ni-Cd Batteries Standard Range - Manual (Page 14)

14 EN-ALPHA-TMSR-001 (10/09)
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4.5 Impact of Temperature on Lifetime
As with every battery system an increased temperature always reduces the expected service lifetime and
although the Alpha Ni-Cd battery is designed to reach a lifetime of over 20 years this is also the case. The
following graph is included to demonstrate that the reduction in lifetime of a Alpha Ni-Cd battery is many times
lower than for a lead acid battery. For Ni-Cd batteries the normal operating temperature is based at + 20 °C (± 5
°C) and, therefore, special considerations have to be taken into account when dimensioning a Ni-Cd battery for
high temperature applications.
4.6 Short-circuit values
The short-circuit values of a Alpha Ni-Cd pocket plate battery depend on and vary from cell range to cell range.
The special values can be provided by our technical staff on request.
4.0 Operating Features, continued
Graph 4-2, NiCd vs. Pb-acid battery lifetimes at higher temperatures as a percentage of operational lifetime at 25°C