Help me convert my old drills

[notagoodwelder]

I have several old battery powered drills that the batteries are completely toast on and they're not worth buying new ones. I'm looking for a transformer so I can run them on AC power. The charger seemed like a good candidate, but too little current to power the drill. I'm looking to basically use someone's trash or something I might have already. A microwave oven is the best thing I can think of now to get me down to ~18v AC. Then rectify to DC. Am I on the right track?

Thanks for any help