The 2998 4S Completer Pack delivers maximum power and run time to your extended-chassis Maxx^® (89086-4) for the speed and acceleration you crave. Punch the throttle and the 4-cell 6700mAh iD LiPo battery lights up the tires for blistering 60+mph speeds and extra-long run times. Traxxas iD batteries are the easiest and safest LiPo charging solution when used with our exclusive iD chargers. You just plug in your iD battery and press start. The iD charger handles all the settings and quickly gives you an optimized charge every time. The new EZ-Peak Plus 4s multi chemistry charger get you back in the action quickly with 75-watt 8-amp charging power for more fun behind the wheel.