How to Convert a Portable Drill Battery Pack to a 120 Volt Cord


Cordless drills are an ingenious invention, and when working correctly have advantages over corded drills. Most corded drills do not have the superior balance, variable speed trigger and other features that cordless models possess. Converting a battery pack to a 120 volt power supply may provide whats needed to give the cordless drill a greater power source. This method will work for drills up to 12 volts. Larger power supplies can be dangerous and should be avoided.

Things You'll Need

  • Screwdriver
  • Pliers
  • Soldering iron
  • Extension cord
  • Wire cutters
  • Jig saw
  • Pocket knife
  • Universal power adapter
  • Remove the screws from the bottom of the drill battery. Open it up and remove the battery cylinders from their casing. In most drills the batteries are directly connected to the contacts that feed electricity to the drill. Twist them with pliers to break the solder and remove them.

  • Cut the ends from a long extension cord. Tie a knot in the cord 2- inches from one end. Use a jig saw to cut a notch in the bottom of the battery case along its top edge on the back side, as wide and deep as the thickness of the extension cord.

  • Fit the knot on the inside of this notch to keep it from pulling out. Solder the black and white wires to the spots where the batteries were connected to the contacts. Heat the connections and wires with the tip of the soldering iron. Hold them together and apply the solder wire, letting it pool, forming a connection. Allow the solder to cool. Fit the battery back together and reinstall the screws.

  • Remove the screws from a universal, adjustable voltage DC power adapter and open it up. Locate the spots where the two wires running to the adapter power plugs are soldered. Break them loose with pliers. Use a pocket knife to widen the hole in the case to accept the extension cord. Fit the cord into the widened hole. Solder the black and white wires to the contacts that the original wires were soldered to.

  • Close the power supply case and install the screws. Set the adjustable power meter to 12 volts DC and plug it into the wall. Insert the battery pack into the drill. The drill is ready to use with its new power source.

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