IMPORTANT: if you want to use this app even screen off, please ignore optimize battery for the application. Easy to check phone battery level from watch widget application. - With the FREE version, the service connection will be keep and alway update. It quite consume battery on Phone and Watch both. - With the PREMIUM version, after you check phone battery on Galaxy Watch, you can disconnect the connection to saving battery both (Phone and watch). Then you can connect again to check battery when ever you want.