Assistance with 18650 3S battery pack for RC
Current is a measure of motor torque load. 

Power times thermal resistant causes temp rise is due to excessive current squared times resistance where Pd=I²R  for R= ESR (equiv series R) that occurs in all batteries.  

Current can be limited by controlling acceleration and thus force. Adding resistance might also but increases losses.

Better quality cells will have lower  ESR higher mA and higher C charge ratings. 

Your choice.

https://www.18650batterystore.com/18650-Batteries-s/106.htm