If my motor and esc are running good temp

If my motor and esc are running good temp what would make my batterys get so hot ?...can it be there 7 year old new batterys ?...I bought these batterys 7 years ago and never used them till now

Most likely internal bridge issue or possible lead issue. Could also be the cells are going bad or are bad.

I think it might have to do with 7 year batterys and never used till now ...one of the first things I did do is test all the battery connection nothing was hot ...I guess I'll find out when I get my new batterys

Maybe the older battery was not designed to handle the current your setup is pulling.

I bought a 4s 3000mah 20c emerland lipo around 2015. I did a test and the internal resistance was measured at .048 ohms. I was limited to running 60amps or around. Trying to higher amps with this battery resulted in battery getting hot.

Also discharging a lipo too much can result a hot battery.

It have cells today with much lower internal resistance capable of handling real high amps without getting hot.

what battery's are you using