Double or Nothing
Many first-generation cordless circular saws lacked power, which caused stalls and binding, and the number of cuts completed with one battery was lackluster, at best. Makita now makes a full-size, 36V cordless circ saw that may give its corded cousins a run for their money. The XSH01X/Z is part of the X2 platform, meaning it runs off two Makita 18V lithium ion batteries, the same battery that powers the world's largest cordless tool selection.
It weighs in at 10.1 lbs, which is less than some corded sidewinders. And while light on weight, it's definitely not light on runtime: Makita claims it can cut 250 2x4s on one charge. Other tools in the X2 family include: chainsaws, blowers, trimmers and a rotary hammer. Buy the XSH01X/Z at stores where Makita tools are sold. Expect to pay about $200 for the bare tool.