had to purchase a new lipo for my losi mini lst 2 with a brushless castle creations 6800 kv, the hobby shop i went to didn't have any and told me they are popular in airplanes so i went and talked to a guy at an airplane specific hobby shop. he gave me a Pro Power 30c 850 mAh 3s 11.1v. just wondering if this is the best battery i should be using and how much run time i get out of it?