Its 70 degrees outside (not hot). I just pulled a brand new battery out at 30%. The battery was putting off heat. Maybe this is slightly normal? But its the first time I really remember thinking, this is kinda warm. Lipos have a bad rap if they get hot. Should I worry? No swelling, no other issues, just kinda warmer then my other batteries. To be fair I did pull the batt faster then normal to switch to another batt.