i run a t4 + b4 , when i went lipo i didnt like the way they handled , kinda unstable , took a piece of 1/2 round lead 6 " long and pounded it flat to the size of the battery box and about 1/16 thick , weighs 1.5 oz. still 3.5 oz. lighter than with sub c's but makes min weight , and handles close to the same , ray