If you push the home button and the sleep button together until the apple reappears, this is like turning your computer off and restarting it. You will not loose information. Your battery indicator may not be accurate. Leave it plugged in to the wall charger for several hours without using it and see if the battery will charge.
And about that soultion , i tried it and the battery is 91% when it opens but before the apple logo appears (a drained battery appears with a red line at the end)