NEW Upgraded 2025 Design.  Don’t be fooled by generic lithiums online, ours are programmed and built with highest quality cells and electronics that are specifically for our bikes and ECS E-assist applications. 60%+ more capacity and power than AGM. 4X-6X life/charge cycles. 1/3rd weight, faster charge. Integrated 300amp BMS computer, digital readout, Bluetooth moinitoring with moble app, Power button and much more.... Lithium-ion is reccomended in any climate that the vehicle is operating in temperatures between 20 degrees fahrenheit and 130 degrees F. (can be opperated as low as 10f), Must be stored and charged in a temperatures that remain between 30f - 130f. If storage temps drop below 20f it’s typically ok, only the pack will not charge until temps get back above 30f. its reccomended they are removed and kept in warmer storage (50f+) during colder off season months. 1 smaller and lighter battery provides easy installation compared to traditional 4 battery grid. Fits in existing battery compartment and connects with just 2 bolts.  Designed Algorthms to be compatible with existing GX4820 Motor charger when changed to Lithium-ion charge setting. Each pack has an internal Battery management system that protects against short circuits, charging overload, discharging overload, charging and discharging temperature protection, and much more.