Get power for your most demanding jobs with the FLEXVOLT® 20V/60V MAX* 9Ah Battery. Compatible with 20V MAX*, 60V MAX*, and 120V MAX* tools, these batteries feature patented technology that automatically switches voltage when you change your tools. Engineered to run cooler than the leading competitor 9Ah battery, this battery provides up to 6X the runtime** when used in 20V MAX* tools.