BatteryInfo: drop private data for gobject
Since the BatteryInfo is a final it can't be subclassed, therefore it doesn't need private data.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Since the BatteryInfo is a final it can't be subclassed, therefore it doesn't need private data.