I would like to give a hint here for everyone who uses Li-Ion packs for eppg.
Li-ion cells work in a very large temperature range without any problems. If, however, a high cell temperature is very often reached under heavy load, the possible number of cycles goes back very far. That means the cells die much earlier.
Some EPPGs have temperature sensors (most KTY 81-210) in the battery as standard, which then show the battery temperature on the display and also provide the esc to reduce power, or cut-off /depends on settings.
If you don’t have that, you can install a temp. Sensor in the battery to watch how hot the battery is while flying.
You can also use ready-made sensors with displays from the barbeque area, or technical area. It doesn’t have to be complicated, it just has to work reliably. So that the display can stay on the motor / frame, the system can be made separable with a plug connection. here in the picture just an example of a cheap, simple solution: https://www.amazon.de/Thlevel-Thermometer-Temperatur-Kühlschrank-Gefrierschrank/dp/B07TY6HRL4/ref=asc_df_B07TY6HRL4/