neither.
if you want one of the best batteries out there, get this one:
http://hobbycity.com/hobbycity/store...cing_Lipo_Pack
it is an enerland polyquest battery. it is a perfect fit in the slash.
They say a good mechanic only needs 2 tools - WD40 & Duct tape. If it moves, and its not supposed to, duct tape. If it doesn't move, and its supposed to, WD40.