P.I.T. Lithium-Ion technology provides the optimum power Battery platform with triple protection Thermal overload protection: Protects Battery if Temperature gets too high Current overload protection: Shuts down the pack in order to protect battery and tool from high current draw Individual cell monitoring: Protects individual cells from over discharging Backwards compatible with ALL P.I.T. 20V tools. Large heat sink that dissipates heat quicker Rubber dampers which absorb movement and prevent damage