P0A80 - Overheating Problem

Congrats on learning how to replace bad modules, not an easy thing to learn... Basically you have a bad module in your pack that is doing ok with sending and receiving amps, but it has a cell that is running hot and will soon fail.

Best way to locate this hot cell is to point a thermal camera at the pack and the hot one will be much brighter than the rest. If you know anyone who does home inspections they own thermal cameras. Or you can buy a used one on ebay for less than $100 like this one: https://www.ebay.com/itm/404302872073 Key tip in buying a decent one is the size of the sensor. Some have thermal sensors so small they're worthless. The link I shared is largest sensor for lowest price. It's still fairly poor quality but way better than others at that price.