/sys/class/power_supply/hidpp_battery_0: DEVTYPE=power_supply POWER_SUPPLY_NAME=hidpp_battery_0 POWER_SUPPLY_TYPE=Battery POWER_SUPPLY_ONLINE=0 POWER_SUPPLY_STATUS=Unknown POWER_SUPPLY_SCOPE=Device POWER_SUPPLY_MODEL_NAME=Wireless Keyboard POWER_SUPPLY_MANUFACTURER=Logitech POWER_SUPPLY_SERIAL_NUMBER=... POWER_SUPPLY_CAPACITY_LEVEL=Unknown