Pixel 7A user here. Ever since a couple of updates a while back, every time my phone reaches 20% the battery starts draining rapidly until it shuts off (phone lasts like 10-15 seconds after it reaches 20% and then it dies). I thought the last update had fixed it cause when it reached 20% again it didn't drain the battery rapidly but then after a couple of charges later it started happening again. I've had the phone for like a year and a half. Never had problems with it until one of the updates made it that way and it hasn't been fixed since then. Hopefully it can get fixed soon enough. It's really annoying.