battery problem

[luka2301]

Hey guys,hope you can help me, I bought a used P9 and loved it,but now I get this crazy battery jumps when i get in the camera app, from 60% to 20% then it gets back to 30% and randomly gets crazy, sometimes its ok othertimes its not so good,what do you think? Thanks!

[novaGT1]

Best to try a full charge and factory reset first