Chosen Solution

I accidentally mixed up the screws that secure the charging cover. I put them back in the right place, but now my phone reboots after about 3 min. Is there anything I can do?

Turns out that the pins on the cable weren’t ligned up right.  They were just a little bit off, and that’s what was causing the issue.  We got them aligned right and everything worked.

Before you mixed up the screws, the iPhone booted properly and worked for more than 3 minutes?

Before the repair, you mean with the original battery? My guess: the replacement battery is a bad one. Try another battery please.

This looks to be a general problem on iPhones whenever thys battery replacement..I’m facing the same challenge. my 6s+ keeps restarting over and over and charge percentage is stuck after replacing the battery… gosh! quite irritating