BSunZi 4-Volt Lithium-Ion Screw Driver, Drill, Multi-Cutter, with 6" Flex Extension ReviewbP PP SunZi 4-Volt Lithium-Ion Screw Driver, Drill, Multi-Cutter, with 6" Flex Extension PLithium Ion Powered. Lithium Ion enables long runtimes and fade-free power. Lithium Ion batteries will also offer long battery life and long storage life (4x Ni-Cad).