@athu68960 this "showing low battery temperature" is common with a bad battery. Replace the battery and reevaluate. Since iFixit does not yet have a guide for that, use something like [https://www.youtube.com/watch?v=PzgOe-9v1qU|this video] to accomplish that. Batteries are readily available at many online stores.
If a new battery does not work either, then you are having issues with the main board. Apparently this is somewhat common for this model and there are many YT videos [https://www.youtube.com/watch?v=7hzGY_FVZSc|like this one] that show a possible solution. Try a new battery first. If nothing else, it will at least give you a known-good starting point for further troubleshooting.
While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.