Apple Watch 3 (battery drained)

[anirudh1950]

Last night I charged my Apple Watch series 3 and battery was at 92%. I slept with my watch and when I woke up in the morning my battery drained to below 10%. I have been using Apple Watch since 8 months now and this is the first time anything like ever happened.

I went to Apple Support and chatted with them and according to them I haven't updated my OS and so was the reason for the drainage.

 

[jcborden]

I've had my AW since April and twice had unexplained drain, the first was over a period of about six hours and the second it drained from 100% to 10% (whilst exercising) in an hour where as normally it would by down to maybe 70-75%... Likely software bugs.

Since updating to 4.3.2 (which admittedly wasn't very long ago) I haven't had any unexplained drain since.