Battery namespace properties:
ChargePercentage [0, 100] - battery charge percentage
Capacity (double, [0, 100]) - current battery capacity
Energy (integer, uWh) - current battery energy
EnergyFull (integer, uWh) - battery energy when it was full
OnBattery [0, 1] - is charger disconnected
IsCharging [0, 1] - is battery charging and not full yet
LowBattery [0, 1] - is battery level below low battery threshold (defined by BATTERY_LOW_LIMIT) environment variable
TimeUntilLow (sec) - approx. time until battery will be empty
TimeUntilFull (sec) - approx. time until battery will be charged
Temperature (integer, °C * 10) - battery zone temperature if provided
Power (integer, uW) - average power consumed during several last measurements (positive - charging)
State (deprecated, string) [unknown, charging, discharging, full, low, empty] - battery state
Voltage (uV) - battery voltage
Current (uA) - battery current (positive - charging)
ChargerType (string) [usb, dcp, cdp, unknown] - charger type ("" - if absent)
Level - (string) [unknown, normal, low, empty] - battery level