To the point that charging it fully does not last long and it drains quickly. My girlfriend has to use her phone alot for work and she finds that it has really been draining quickly despite leaving fully charged in the morning. She's closed out background stuff and battery usage on apps seems pretty normal. Is there anything else to look at that could be draining things. Or is it really possible to just wipe it out completely so it won't hold a charge for as long as usual. Worth changing out the battery? I hear it is complex to do so?