TechniSat VIOLA 2 Instruction Manual page 18

Damaged devices or damaged accessories must not continue to be used.
Using the batteries
Ensure that the batteries are kept out of the reach of children. Children could
put the batteries into their mouths and swallow them. This could lead to serious
injuries. Seek medical advice immediately if this occurs! Therefore ensure that the
batteries are out of reach of young children.
Only operate the device using the batteries approved for this device.
Normal batteries may not be charged. Batteries may not be reactivated using
other means, disassembled, heated or disposed of in an open fire (explosion
hazard!).
Clean the battery contact and device contacts prior to inserting them.
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