The status of the battery.
unknown(1) indicates the device status is unknown.
notInstalled(2) indicates the device is not installed.
ok(3) indicates the battery status is OK.
failed(4) indicates the battery status is failed.
highTemperature(5) indicates the battery has a high temperature condition.
replaceImmediately(6) indicates the battery must be replaced immediately.
lowCapacity(7) indicates the battery has a low capacity.