Following points in Nickel-Cadmium Batteries should be observed:
For an optimized lifetime capacity, the battery should be always driven empty and then again charged fully. This eliminates the so-called "Memory effect", which could influence the driving range. Cold temperature too affects the range, hence for an optimal operating temperature, the battery must be kept at 25°C.
If the vehicle is not in use for longer time, it is important that the battery is fully charged before storage. Should it be longer than 2 months, then the battery must be fully charged again to avoid low discharged, which can affect the performance of the battery.
The storage temperature must not be under 5°C and humidity to be not under 40%.
The battery case must be stored separately from the vehicle. This will eliminate damage to the battery case.
To obtain the full capacity of the battery again after a long non-operation, the battery Akku must be completely discharged and fully charged for several times (Cycled) until the battery capacity is fully restored.