Battery Service

If the device definition from Zigbee2MQTT contains at least one of the exposes entries listed in the table below, a Battery Service service will be created.

Name	Type	Required access	Characteristic	Remarks
battery	numeric	published	Battery Level	If battery_low is not present, this property will also be used to indicate a low battery if the value gets below 30%.
battery_low	binary	published	Status Low Battery	If battery is not present, the binary value of this property will be used to fake a battery level. If it is true, it will report a level of 0%. If it is false, it will be 100%.

Note that the required Charging State characteristic will currently always report NOT_CHARGEABLE, as the Zigbee2MQTT does not (yet) provide an common property to detect if a device is charging or not (and therefor if it is chargeable).