what battery to use?

just wanted to know what true rc battery's should i use in my losi 8 buggy?
and will be usings the new monster mamba esc,and a medusa 36-60-2000 motor.last time i was useing a 4s 14.8 4000mah true rc battery and a 8xl motor and burn up one if the packs.i was told that i was using the wrong pack.it only had 10 to 15c rating,and was told that it was not high enough.
any help on this i dont want to mess up any more battery's.