... This series are designed specially for cordless power tools, which possess higher discharge voltage. This series are designed specially for cordless power tools, which possess higher discharge ... , over-charging, high temperature, and so on.3. Green power, ST battery is free of Pb, Cd, Hg, Cr6+, PBB and ... performance, maintenance-free and wide application. F13000mah 24v ni-mh rechargeable battery pack