How long does the Apple Watch battery work before it needs charging?
How long does the Apple Watch battery work before it needs to be charged?
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You would need to check each series to see what apple says. The series five said about18.5 hours. That said a lot of factors affect the length of time it runs. These are all good places to read about this. I charge my battery every night for enough time to top it off. Usually an hour or less. This way I can sleep with it on until the next night. On one of my busy days where I use the timer a lot and some other app it got down to about 30 percent after about 20 hours. I don't have a lot of apps running in the background so that may be why it last so long for me. Today I have had my watch run down to 70% after 10 hours. Everyone's time will be different.
Apple Watch Battery and Performance - Apple Support
Batteries - Maximizing Performance - Apple