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