The iD system detects which Traxxas iD-equipped battery you are using and automatically configures the charger’s settings for the optimal charge. An LED progress bar and audible alerts keep you informed while the advanced high-resolution peak detection delivers a perfect charge every time. One-button Storage Mode protects your LiPo battery investment by safely preparing the batteries for extended storage. With up to 8 amps of charging power, the EZ-Peak Plus 4s is the fastest, easiest, and most convenient way to charge your Traxxas batteries.