iPhone powers off randomly even after battery replacement

There are a lot of poor quality batteries out there so ideally you need to use a known-good battery (the 6S and 6 Plus batteries are compatible) to help you determine if the issue is the battery or something else. It could be the charge port or the charge circuit on the logic board.

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I got the battery from wholesalegadgetparts. Is there a way for me to test it if it’s charge port or charge circuit?

Jordan 의 2019년 1월 17일

If you suspect the charge port, install a replacement charge port (overlay it, no need to do a full install). The same caveat applies in regards to known-good parts. If the battery and charge port don't solve the problem, then you have a logic board issue.

Minho 의 2019년 1월 17일

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I got the battery from wholesalegadgetparts. Is there a way for me to test it if it’s charge port or charge circuit? — Jordan
If you suspect the charge port, install a replacement charge port (overlay it, no need to do a full install). The same caveat applies in regards to known-good parts. If the battery and charge port don't solve the problem, then you have a logic board issue. — Minho