A year and a half ago, I pitted the Milwaukee M18 model 2610-24 drill/driver kit against eight powerful competitors for JLC (“Heavy-Duty 18-Volt Drill/Drivers,” 1/12). Right after that, Milwaukee introduced the M18 Fuel drill/driver, which is its first version with a brushless motor. Brushless motors are more compact than standard brushed ones, and they’re supposed to be more durable and efficient. The brushless 2603-22 kit originally included the same 3-amp-hour batteries packed with the 2610-24, but it’s now shipping with Milwaukee’s new 4-amp-hour ones. You can also buy the new batteries separately to upgrade any M18 cordless tool.Runtime. On paper,...

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