That is for Dewalt's "Nano" lithium-ion cordless line, which are pretty expensive. Dewalt's NiCad cordless tools top at 24v.
Voltage translates loosely to torque. For serious work, I wouldn't go less than 18v for a drill. The downside with a 24v tool is weight.
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Dewalt's cordless tools go up to 36v
That is for Dewalt's "Nano" lithium-ion cordless line, which are pretty expensive. Dewalt's NiCad cordless tools top at 24v.
Voltage translates loosely to torque. For serious work, I wouldn't go less than 18v for a drill. The downside with a 24v tool is weight.