I want a device that will allow me to plug my 18v cordless drill battery into it to jumpstart a vehicle, recharge a battery or boost a weak one.

Cordless tools have evolved to a point where the batteries store a really large amount of power. And I have them around often. I know that companies are successfully selling 'jumpstarters' that contain their own battery--why not just sell a device that will allow a fully-charged 18V drill battery to plug into your cigar lighter or clip to the existing battery to do the same thing.

I have cordless tools around but still, when I need to jumpstart the lawnmower or the tractor, I have to drag an extension cord across the yard to it to put a real charger on it, or try to get a car near to it.

A drill battery could easily start an ATV or PWC, or if you need to start a car that's dead, you could leave it plugged in a few minutes to recharge. You could put in current-limiting to keep it connected and boosting while you crank, but not damage anything.

Good idea?

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