The FLEXVOLT 20V/60V MAX 12.0 Ah battery provides up to 8X runtime (With DCB612 FLEXVOLT battery when used with DEWALT 20V MAX tools compared to DCB201 1.5 Ah battery pack.) in 20V MAX and delivers ultimate power in 60V MAX and 120V MAX cordless tools. It changes voltage when you go from 20V MAX to 60V MAX tools. Lithium Ion technology delivers performance in the same size as our 9.0 Ah battery, so it is more powerful in as compact a package as possible. It also includes a built-in LED Fuel Gauge for instant charge status, and is compatible with 20V MAX tools and chargers.