Battery health on my iPhone X had degraded to 74% so I did some research on the internet to find out how to replace the battery myself. I decided to go with iFixit. Their new battery is rated at 2974mAh (same as original). Made by Desay Corporation (same as the original) on Aug 30, 2021 (Coconut Battery App). Purchase price was $44 which included all tools, battery and water seal/adhesive. On a scale of 1-10, I'd rate the difficulty at a "7". You need to keep track of where the removed screws came from, as there are different sizes and types. I had to remove the taptic engine in order to get the adhesives holding down the old battery out. Some folks keep the taptic engine in when removing the battery adhesives, but it is much easier with it out. Patience, taking it slow and being organized is your friend. iFixit has a video, but I used the video by "iDoc" on Youtube as it included the removal of the taptic engine. Very thorough video, highly recommended:
The tools provided in the iFixit kit were very good, and the battery is working fine showing zero charge cycles and 100% capacity. So far, so good!
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