See: Speedzone USA

Speedzone USA have added to the Evolution Competition Series brand three new LiPo batteries. The 5500mAh 7.4V 130C 2S slim LiPo pack measures 139×37.3×24.8mm and weighs 238g, the 5000mAh 7.4V 120C Shorty LiPo park measures 96×46.5×24.5mm and weighs 212g and the 6000mAh 14.8v 120C 4S LiPo pack measures 139x47x48mm and weighs 534g. All packs were designed to produce high voltage with low internal resistance and utilize 5mm bullet connectors.