Quote Originally Posted by plargen
snip
Yeah, we're running the motors hard but the reason for them burning out is because of the gearboxes failing. Even if it were just the motors, I reckon those 14.4v ones are actually 12v motors overvolted. Doing the math, 550rpm (12v) overvolted to 14.4v gives 660rpm, give or take some. I'd say there's a fair chance those motors are actually 12v.

Also the build quality might well be better, as it's slightly more money for just the drill unit. You're not paying for the battery(s) nor charger. Interesting!