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I just replaced the battery in an iPhone 6. Everything went smoothly. I powered it on and let the battery drain to 10% as recommended by the iFixit Kit. Now the Battery is stuck at 9%. I double checked my work. I made sure the battery clip where it attaches to the MB had a bit of insulation. I went as far as putting some electrical tape on the back of the battery clip hold down cover. Need some help. The phone has been on the charger for a couple days and it’s not charging. While on the charger the phone will just shut down and reboot at random times.
The first thing to try is to put back your old battery and see how behaves. If it behaves normally, even though it isn’t that good, then the problem may be your replacement battery, in which case you will want to contact iFixit Support (help.ifixit.com). If the old battery behaves the same way, then your problem may be on the logic board, such as a damaged connector. To be certain, use a battery utility, such as coconutBattery (for Mac) or 3uTools (for Windows). It will tell you what the health of the battery is. Anything less than 80% of design capacity will require replacement. 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.
That sounds very much like a tristar i.c failing It’s normally caused by using non Apple chargers It is repairable but you would expect to pay £40-£60 depending on where you go
