Panasonic has been a battery and charger pioneer for more than 90 years. The same Panasonic Li-ion technology that powers the most advanced electric cars also powers our cordless assembly tools. Our Ni-MH battery packs power lighter duty Panasonic professional screwdrivers. Our innovative Li-ion GuardION system ensures long life and safety with the tool, battery, and charger working together as a single energy efficient battery management system.