XR FLEXVOLT JUST GOT BETTER. The DCS579 54V Circular Saw has up to 47% more power when used with a 9Ah battery than the DCS576. With a no-load speed of 5800 rpm, this saw delivers the power of a corded circular saw with the portability and convenience of cordless. The base of the saw is compatible with all DEWALT plunge saw rails for increased accuracy.