Traxxas 2S 750mAh 7.4V 20C LiPo iD Connector Soft CaseTraxxas Certified iD Equipped LiPo batteries provide the punch and on demand power to achieve the maximum performance Traxxas models are built to deliver. Traxxas exclusive iD battery system is the easier and safer way to charge your Traxxas batteries. Only Traxxas gives you more of what you want most: simple installation, a great price, and the most speed and run time available. Replacement part for these models: TRX 4M 1 18 1979 Chevrolet K10 High