My battery keeps dying at high charge

You may have a poor battery condition which cannot provide sufficient power for peak performance. What is the Battery Health of your iPhone? Open Settings ➔ Battery ➔ Battery Health and let us know which percentage you see for Maximum Capacity. Also note what is written under Peak Performance. If your battery's Maximum Capacity shows a value of 80% or less, then it has gone through its lifecycle and therefore should be replaced, according to Apple.

Axel F.

Thanks for taking the time to respond. Just looked and it’s a version 9.3. Like three years old but didn’t use it for 2.5 of those years. The battery Health on the actual watch says 100%. Thanks again.

My battery health says 100% and my watch is dying 6 hours after a full-charge.

Which battery health says it is 100%? Your iPhone or your Apple Watch? Which model Apple Watch do you have?

Axel F.