Chosen Solution
I replaced my battery two days ago. The firs time I charged it it only went up to 83% percent and while I used it throughout the day, it continued to stay at 83%. However, the phone just shut off after 7 hours of use without a low battery warning and started to reboot itself over and over again. I turned my phone off and charged it and now when I try to use my phone it shuts off after a couple of minutes and reboots itself every time.
It sounds like you have a defective battery. To test this, you could reconnect your original battery to see if these symptoms go away. If the original battery works “normally” then I would contact your vendor and ask them to replace this battery.
