DeWalt DCB609 FLEXVOLT 20V/60V MAX* 9.0Ah Battery

This is a DeWalt FlexVolt 9.0 Ah battery that works with both 20V and 60V tools. It's a heavy-duty lithium-ion pack that automatically switches voltage depending on what tool you're using. Used, but it's still in solid shape with some typical scuffs from being in a tool bag. Great if you need that extra runtime for high-demand jobs.