Get power for your most demanding jobs with these FLEX™VOLT 20V MAX*/60V MAX* 9Ah Batteries. Compatible with 20V MAX*, 60V MAX*, and 120V MAX* tools, these batteries feature patented technology that automatically switches voltage when you change your tools. When used with 20V MAX* tools these batteries provide up to 6X the runtime* to maximize productivity on long days. (NOTE: This YY version is due to packaging changes)