[Q] My phones battery life isnt being displayed correctly?

Im not really sure why, but my phone has been acting very strange for the past week. If I restart my phone it displays a different battery percentage than it was before. For example, I charged my phone up to 100%. Then when I restarted the phone, it was at 81%. I'm not really sure how to go about fixing this. I cant re-calibrate my battery because it will randomly restart and then have 5% battery left, then continue in a cycle of turning on and then restarting. Is my battery itself the issue? Or should I try completely resetting my phone by going back to the factory kmz file? I tried switching roms and I still had the same issue.

Heres an example of the ridiculous jumps in battery life after a re-boot.

from xda-developers http://ift.tt/1FgZP4U

via IFTTT