The 3s LiPo completer pack includes a 2849X 3-Cell 4000 mAh 11.1-Volt LiPo battery and a 2970 EZ-Peak® 4-amp LiPo charger. Traxxas LiPo completer packs deliver the ease and simplicity of 1-button charging with the Traxxas iD® system. There's no need to be a battery expert or learn how to navigate complex menus. Just plug in your iD-equipped battery and press Start. The EZ-Peak charger does all the work for you. Get back in the action quickly with the faster, easier, and safer way to charge your premium Traxxas Power Cell LiPo batteries.