Chosen Solution
Successful replaced my iPhone 6 battery but it won’t charge past 1% Any ideas
It is possible that your replacement battery is defective. It also sounds like the problem was more with the charging circuit than the battery. If you have access to a USB Ammeter, you could use that to determine if the phone is really drawing current when it says it’s charging. I would try a known-good battery to eliminate that possibility. Otherwise, you will need to have your phone looked at by a micro-soldering repair shop.
What was the point to change your battery? Are your phone wont charge or you had battery drain?
Did it charge before you changed it ?, if it did you have a bad battery. If not you more thank likely have bad tristar and / or active diode.