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My Apple Watch screen lifted and come to find out it is due to the battery overheating and it swelled. Just curious if it could be fixed?

Yes, It can be fixed! Given the fact the screen is already pulled away a bit it should make doing this your self much easier. Are you up to it? To help you, review this vid of Alex opening a Series 2, it’s the same for your Series 1 (the Original Apple Watch is a bit different) How to Replace the Battery on an Apple Watch Series 2 and you might want to review the Original Apple Watch guides while slightly different the same techniques are needed: Apple Watch Battery Replacement I’m sure you can forgo the iOpener as the display is already lifted. You will need to fully clean the surfaces of the old gasket both the case and the display. And do be gentle! The parts can be easily damaged. Here’s the needed parts: 38mm Watch Apple Watch (38 mm Series 2) BatteryApple Watch (38 mm Series 2 & Series 3 Cellular) Force Touch Sensor Adhesive Gasket 42mm Watch Apple Watch (42 mm Series 2) BatteryApple Watch (42 mm Series 2 & Series 3 Cellular) Force Touch Sensor Adhesive Gasket Just take your time and don’t forget to breathe ;-}

Apple has extended its service coverage for Apple Watch (1st gen) models experiencing expanded/swollen battery problems to three years, covering customers for service for an additional two years beyond the complimentary 1-year Limited Warranty that it provides with the device. https://9to5mac.com/2017/04/28/apple-wat… They will fix the watch for free. You need to call Apple; and provide this information about the extended coverage for series 1 only.