Experience all the performance that's been engineered into your Traxxas models! Our new iD-Equipped Power Cell batteries deliver unmatched speed, acceleration and power in all Traxxas cars, trucks, and boats. Traxxas Power Cell Battery Packs are optimized for free-flowing power and maximum punch with premium quality, low-resistance cells; flexible, silicone-jacketed 12AWG wire; heavy-duty welded tabs; and Traxxas' High-Current Connectors. Precision assembly with attractive, individually wrapped cells and clear overwrap complete the package. Power Cell batteries are available in standard, 6-cell "flat" configuration as well as 7-cell flat and "hump"-style packs. The 7-cell pack offers 15% more voltage to give your model maximum acceleration and speed—depending on your model, top speed can increase by as much as 10mph simply by installing a 7-cell pack, no other modifications required! The 7-cell hump pack fits in all Traxxas models except E-Maxx, Summit and E-Revo, which require a flat pack configuration. Experience faster acceleration, faster top speeds, and Traxxas quality and support with the only batteries engineered for your Traxxas model. Traxxas Series 5 Power Cell batteries offer the maximum possible capacity in an iD-equipped Power Cell NiMH pack! Experience the longest run times and highest sustained voltage under load, ideal for peak performance in power-hungry models, such as the brushless-equipped Rustler VXL, Bandit VXL, Stampede VXL, E-Maxx Brushless Edition, and E-Revo Brushless Edition Traxxas Series 5 Power Cell batteries feature the latest 5000mAh NiMH cells, and are available in 7-cell hump and flat configurations to fit all Traxxas 1/10 scale electric models. New 8-cell packs are also available for an incredible 9.6v power boost! For proper fitment, Series 5 eight-cell batteries require an optional Expansion Kit (#3725x for Rustler, Bandit, and Stampede; #6727x for Stampede 4X4; #5827x for Slash and Slash 4X4).