Silvercrest WD1610 - Manual (Page 79)

Wireless Door Bell WD1610
78 - English
Batteries
Insert the batteries with the correct polarity.
Never try to recharge the batteries and under
no circumstances throw them into fire. Do not
short-circuit any batteries. Remove batteries
when the device is not to be used for a long
time. Non-intended use may cause explosion
and danger to life. Leaked batteries must be
handed in to a collection point for old batteries.
Make sure you wear protective clothing (such
as gloves) when manipulating leaked batteries.