Metabo HPT 372121M 18 Volt and 36 Volt MultiVolt Lithium Ion Slide Battery 8.0-4.0 Amp Hour (BSL36B18)

• Power source option for the MultiVolt power tool platform that offers the power of a corded tool, the freedom of a cordless platform and the choice to operate all MultiVolt tools with a battery or plug into an outlet. It's Cordless, It's Corded, It's BOTH.
• Battery delivers 4.0Ah of runtime at 36V in MultiVolt tools, also 18V slide type tools including cordless nailers generating an impressive 8.0Ah of run time for increased flexibility and multipurpose use
• Higher capacity battery cell technology with 21700 cells that deliver over 1.440W of power- roughly 46% more capacity than a standard 18650 cell battery resulting in longer runtime and increased power output
• 4-Stage fuel gauge located on the face of the battery to make it easier to monitor the charge status
• Multiplex Protection Circuit in the battery, communicates with the tool and charger preventing from over-load, over-charge and over-discharge to improve safety and ensure a long battery life

A revolutionary cordless-corded power tool solution that meets the power output demands on a jobsite. MultiVolt tools can accept a 36V battery OR plug into an outlet with the AC Adapter. This unique platform changes what's possible on the jobsite by offering the power of a corded tool, the freedom of a cordless platform and the choice to operate all MultiVolt tools cordless OR corded.