This brushless small angle grinder requires no time changing brushes, and offers a longer motor life. It offers a high level of protection. Its break stops the wheel in 2 seconds or less. The Kickback Break engages maximum force to stop the wheel when there is a pinch, stall, or bind-up to reduce kickback. The grinder will also shut off in those events to further protect the user. This kit includes our most powerful battery in its class, the 20V MAX DEWALT POWERSTACK™ 5.0 Ah battery utilizing revolutionary pouch cell technology to deliver 50% more power, 50% more work per charge, and 2X the lifespan. The DEWALT DCBP520 is compatible with all 20V MAX tools and chargers.