12-11-2014 04:02 PM
I used to get 30 hours per charge but over the last few months I'm down to 8-10 hours. I bought several new batteries from several sources with no improvement. Turned off all running services, apps, syncing, backups, etc. with no improvement. Finally through the use of some apps I discovered most of my battery drainage is coming from "Android OS" and more specifically a kernel wakelock simply referenced as "usb". And yes I have thoroughly cleaned my usb port.
Any ideas what is causing this and how to fix it?