The Didactum appliances rely on the monitoring systems 1.5V SR44 battery. This battery is used for storing the time and date. In rare cases this battery needs to be changed once. Be sure to dispose of the old battery properly!
This battery change is only possible when the power is off!
If you have the SR44 battery, as well as the installation of the LR44 battery is possible. Note that the LR44 has a shorter period of time. It is recommended to only use name brand batteries!