AEG LL1230 Original Instructions Manual page 31

To obtain the longest possible battery life remove the
battery pack from the charger once it is fully charged.
For battery pack storage longer than 30 days:
Store the battery pack where the temperature is below
27°C and away from moisture
Store the battery packs in a 30% - 50% charged condition
Every six months of storage, charge the pack as normal.
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