I don't even know why I'm wasting my time with this. This is a LIPO battery from my garage

This is a volt meter on the same 3 cell LIPO battery that I just charged. 12.5/3=4.16V
Here's a datasheet for a random LIPO cell with the charge voltage highlighted
If you somehow discovered a 4.7-5V lithium rechargeable battery, hurry up and patent it. Everyone in the battery industry knows that the electrolytes in the batteries aren't stable at that high of a voltage. What happens is that the electrolyte breaks down and starts forming CO2. Probably what happened to you guys
https://www.arl.army.mil/wp-content/...trolyteAdd.pdf