My cell Phone would die at 71 percent but plugged into a charge worked just fine.
My son did the repair with the great tool kit we purchased. It took him about 20 minutes.. Followed the calibration instructions and my phone now lasts all day. So glad I found you guys.
Give your phone a second life. See if Ifixit has the stuff to get you back into the action and save yourself the price of a new phone.