My phone's battery was draining crazy fast after the last update
I was losing like 40% charge before lunch, which never happened before. I went into the battery settings and saw 'Google Play Services' was using a huge chunk of power. On a whim, I cleared its cache and data, then restarted. The drain stopped almost completely the next day. Has anyone else fixed a weird battery hog this way?
Clearing app data is the tech version of turning it off and on again, but it actually works half the time. @the_brooke is onto something with the Fitbit fix, it's wild how a simple reset can stop a battery murder spree. My old phone used to get eaten alive by some weather app until I nuked its data. These background services just seem to lose their minds after an update. It's a good first step before you start blaming the battery itself.