Im using my semovar with either Hi Drain Efest purple 35A IMR or Panasonic Li-ion protected.Both working without issues.
Stick with an IMR battery, safest.
Mine never get warm, just from own hands.
EDIT
Forget what i said, i just googled my Li-ion
batteries, my other 2 are CGR18650CH, witch are hybrids, and 10 Amps.
Anyway, if your battery is getting hot, you probably have a defective battery. Stop using it now.
Better be safe than sorry, you wouldnt want it to flame or explode. The best outcome of a cracked battery is you losing your
mod. The bad outcome is your losing your hands.