Upgrade your Black & Decker power tools with our custom 40V 2000mAh 18650 battery pack! This USPECIAL PK-402010BD battery provides reliable 800W power (10C rate) using ten high-performance lithium-ion cells. Compatible with Black & Decker 40V series batteries (2.0Ah - 6.0Ah) and chargers. Get unparalleled performance and flexible capacity options for your demanding applications. Size: 128*80*76mm.