The only thing you can do for now is try to keep things from draining your battery. Make sure location/wi-fi/bluetooth etc are all turned off when not in use. Close all background apps when finished; button left of the home key. Check out Settings>Battery to see what app uses what % and use Settings>Power Saving to help reduce battery drain. Use a standard still wallpaper and not the in motion wallpaper. Dim your screen all the way down when possible or use Auto.