Gens ace 5300mAh 3S 60C 11.1V Hardcase 15# Lipo battery is new customized for HPI 1/8 savage flux, VORZA FLUX HP, TRAXXAS 1/10, TRAXXAS Rustler, E-MAXX/E-REVO, 1/10 SLASH, XRAY 1/8 808E, SERPENT 1/8 811E etc, with consistent high power output, best choice for bashing, no puff after long time use, advanced lipo tech used in the new pack. And it is also suited for 1:10 OUTCAST.