A. If you replace the battery yourself, it may void your iPhone's warranty. Hence, it is recommended that you replace the battery at an authorized iPhone repair center.
Fixing your iPhone keeps turning off problem could be challenging, but with the right method and proper guidance, it can be done successfully. Remember to identify the root cause of the issue, back up your data, and choose the right method that suits your iPhone. If none of the methods work, seek professional advice. Good luck!