I try to be conservative and only use my phone a little, I didn't even play games/videos and still it went from 100-22% in under 6 hours... like how did it even?

Is it a oneplus?

@dieterdw my OnePlus 3T lasts a day with heavy usage, up to 3 days if very low usage. I find it to be a tiny bit too agressive with battery saving at times.
Although, if I constantly use it for like games or video or devRant the screen kills the battery like crazy.

It's an iPhone 5S, I guess it was facebook messenger that drained it :/