Auriol 4-LD5972-1-2 Bedienungs- Und Sicherheitshinweise Seite 12

Note:
 Non-rechargeable batteries must not be charged!
 Different battery types or new and used batteries must not
be used together!
 Do not short-circuit the connecting terminals.
 Empty disposable batteries/rechargeable batteries must
be removed from the device and safely disposed of (see
Disposal of batteries)!
 If the device is stored unused for a prolonged period of
time, the batteries/rechargeable batteries should be
removed.