My six year old Apple Watch series 6, 44mm, Titanium is having battery dropp-off. I used to get through the night with 50% battery but recently is is dropping to zero overnight. Is this normal or do I need a new battery?
Apple Watch Series 6, watchOS 10
When the watch was new, the expected battery life was rated as 18 hours with average use.
It's likely time for a new watch.
Apple Watch Battery and Performance - Apple Support
M1 Mac mini, macOS 14.3.1; Watch, series 7 GPS/cellular, watchOS 10.3.1; iPhone 12 Pro, iOS 17.3.1; TV 4th Gen, tvOS 17.3; HomePods, audioOS 17.3 and Airport Express w/ Airplay 2
What is the expected battery life of a Apple Watch 6?
