Ive got an Axon 7 that shuts down at 15%, when I plug the charger in itll be something like 54% and when I turn it on the battery might be something totally different. Last nightafter it closed itself down I charged it to 100% while it was off, switched it on and it was at 100%. I watched a couple of videos, then closed all apps and turned wifi & mobile data off and it dropped to 2%. There it stayed until 11pm that night, I moved some files from phone to sd card and it lost power. I plugged it in and it was reading 34% while it was off. Can someone tell me whats going on, is the battery knackered or is it just out of sync?