The Traxxas 7-Cell NiMH Battery/Charger Completer Pack includes a Traxxas 7-Cell NiMH battery (TRA2923X) and 2-Amp NiMH Peak Detecting AC Charger (TRA2969). This is compatible with models that can use long battery packs, like the Slash, Slash 4X4, 1/10 Rally, TRX-4, and 4-Tec 2.0.