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i have changed the battery of ifix dog my iphone x but even though it is a new battery it drains very fast i don’t know why even though it’s a new battery it doesnt seem like i don’t know what to do

Phat nguyen, the text came through a little garbled in the translation. Are you saying you bought the battery from iFixit? They have an excellent warranty policy that’s good for one year on batteries, so if you need a replacement you can contact them at support@ifixit.com. That being said, you should definitely try the suggestions posted by @willjoe, and if those don’t work you could try a complete wipe and restore of the phone (back it up first, obviously). Once you have exhausted all of the software solutions available, then you might consider contacting the seller to ask about a replacement battery.

How to fix an Apple iPhone X battery that is draining so fast after installing an iOS update [Troubleshooting Guide] First solution: Force close background apps. Second solution: Manage and adjust settings. Third solution: Install pending app updates on your iPhone X. Regards, Will