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Ok, you probably know about this but what the heck. Most cordless drills are not meant to be tightened by holding the chuck and running the drill. The ones that are have one large surface on the outside of the chuck for you to grip.
OTH, most have one large grip, and a second smaller "ring" below it that doesn't really look like it's meant for much. On these, you must hold that smaller ring while twisting the large one tight. This is the only way to really get it tight, and supposedly you stress out the drill by doing it by running the drill (which I do anyway, if the torque load won't be high).
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