Currie Technologies introduces our K2 Energy Lithium Phosphate (LifePO4) battery pack upgrade kit which includes an advanced charger and an engineered battery management system that enables plug and play use with all Currie RMB E-Bikes. It"s safe, offers extreme long cycles, quick charge times, weights less, is more powerful, and reduces environmental concerns. Performance may vary depending on application. Caution: Risk of fire, explosion or burn. Do not short circuit, crush, incinerate, heat above 100 degrees C or disassemble. Please recycle. Use only recommended charger.