Every time I checked my battery usage, obviously the phone shows the keyboard at the top. But I noticed it glitched like half a second. After really paying attention to it like half-second glitch I noticed it said something behind my keyboard, that wasn't my keyboard, so I screen capped it. Didn't know if this could even remotely be part of the problem, but hey, thought I'd post it anyways.
Half-second glitch thing:
Battery usage after the half-second glitch thing:
Half-second glitch thing:
Battery usage after the half-second glitch thing: