Reason for boot looping

I did a battery and a charge port replacement on this iPhone 7. Prior to the repair the device was working just fine, image displaying, touch was working, etc. I finish the repair and then the device turns on and then every 3-5 minutes it starts boot looping. So then I assumed that it may be boot looping due to receiving a bad charge port replacement so I replaced it with a new one. That does not help at all. The device is still boot looping.

So then I checked out the Panic log and got two different panic logs. 1.) "Missing sensor(s) TG0B \nservice. and then 2.) "i2c1::_runinterruptmode timed out waiting for interrupt, last read status 10210118 int shadow00290100 Ofer 00000000 fifo 00000004 for device pmu"

So now how do I go about this? Is this going to be a battery issue or a motherboard issue?

I mean as of right now I am leaning towards testing another battery. to see if that may fix the problem.

Any bit of knowledge would be helpful!! Thank you for your time I really appreciate it!!