Apple watch V2 battery life stuck on 100%

Hi

Whilst I can't say why that is happening, your Apple Watch may require battery service.

Before contacting Apple, the following steps may help (I appreciate that you have already tried some of these, but it may help to repeat them in conjunction with the additional suggestions):

If you have not yet done so, update your iPhone and Apple Watch to the latest compatible software versions, starting with your iPhone:

• Update the iOS on your iPhone, iPad, or iPod touch - Apple Support
• Update your Apple Watch - Apple Support

Install any available updates for apps on your iPhone.

Check that you are following Apple's charging instructions, including:

• Checking that your Apple Watch is connected to the charger, correctly aligned and touching it fully, and connected to power.
• Using original Apple or MFi-certified charging accessories.
  • If you are already doing so, try using another such cable and/or power adapter.
• Checking that all wrapping has been removed from all items, including checking carefully on the head of the charging cable.
• Checking that the charging cable and power adapter are fully inserted into the port and power socket.
• Check your battery and charge your Apple Watch - Apple Support

• If your Apple Watch won't charge or it won't turn on - Apple Support

Restart both your iPhone and your Apple Watch, turning both off together and then restarting your iPhone first:

• Restart your iPhone, iPad, or iPod touch - Apple Support
• Restart your Apple Watch - Apple Support
• If the issue persists, next close open apps on your iPhone and then restart both devices again.

Unpair and re-pair your Apple Watch again:

• The Watch app on your iPhone takes a backup of your watch automatically when unpairing via the app.
  • When setting it up again, initially choose to Restore from Backup. Most data and settings will be restored, with some exceptions (eg Apple Pay cards, passcode).
  • If the issue persists, consider instead unpairing and setting it up as a new watch.
• Unpair your Apple Watch and iPhone - Apple Support
• Set up your Apple Watch - Apple Support

Having tried the previous steps, if the issue persists then I suggest contacting Apple Support (remote diagnostics and/or mail-in service may be available, if required), making a Genius Bar reservation or visiting an Apple Authorised Service Provider for assistance:

• US: Apple Watch Service Answer Center - Apple Support
• Elsewhere: Select your country for Apple Watch service and repair information

I’m having the same problem with my series 3 watch and I only had it since the first week of January so it’s barely a month old. I paid an awful lot of money for this watch so I think it’s rather poor that we have to jump through all these reset and restart to fix an issue that should never have occurred if this stuff was tested properly. Given the halo that Apple wears and the premium price we pay for the product one would expect better. I have done all suggestion and now have to waste time to go book an appointment at the Genius Bar.