The box AK 10 User Manual page 12

Safety instructions
12
NOTICE!
Possible damage by leaking batteries
Leaking batteries can cause permanent damage to the device.
Take batteries out of the device if it is not going to be used for a longer period.
NOTICE!
Possible damage due to incorrect storage
Deep discharge can cause batteries to become permanently damaged or lose
some of their capacity.
Before prolonged rest periods, charge the batteries to around 50 % of their
capacity and then switch the equipment off. Store the equipment at a tempera-
ture between 10 °C and 32 °C in as dry an environment as possible. During
extended storage periods, charge the batteries to 50 % approximately every three
months.
active speaker