I've run a 9L and 10L on 14 cells, both were close in terms of speed (with gearing changes) and they both are way too hot for my liking. I run about 7 mins in practice and they are VERY hot (180-210). For the races, I only need 5 mins so they are usually 170-200, I let them cool then run again. When my 10L dies, I'm getting an XL or one of the Lehner 1950's.