... higher discharge voltage. This series are designed specially for cordless power tools, which possess higher discharge voltage, and can be charged at ... -charging, high temperature, and so on.3. Green power, ST battery is free of Pb, Cd, Hg, Cr6+, PBB and PBDE, they ... use.5. Rapid charge performance, ST batteries have good performance of rapid charge within 15 minutes - 1 hours. Discharge rate can ...