AEG BBH 18 Original Instructions Manual page 39

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.
www.a e g - p o w er t ool s . eu
(03.16)
4931 4142 14
Techtronic Industries GmbH
Max-Eyth-Straße 10
71364 Winnenden
Germany