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I had this nice Craftsman® cordless drill for years. It was a gift from one of my brothers and it served me well for a long time. After repeated use and abuse, the battery stopped holding a charge. I decided not to buy a new battery and convert the drill to be powered using a plug meant for a cigarette lighter socket. I was inspired by Bikeframe's instructable Run a Drill of a Car Battery.

Step 1: Removing the Battery Cells

The first thing that I did was to remove the cells from inside the battery case. I unscrewed the top of the battery to get inside. I found that the battery terminals were held by a cell. I measured the thickness of the cell with a caliper and the cell was 0.88 inches thick (22.3 mm). Since I am also an environmentally conscious person, I made sure that the cells are recycled with my town’s recycling program.
Carefully I pried the positive terminal off the top of the cell. I soldered a wire to it and put it back on the plastic part that held both terminals. To replace the cell that originally held both terminals, I cut a piece of plastic conduit. I cut the plastic conduit with a hacksaw and smoothed the ends with sanding paper. I also drilled a hole to pull the red wire from inside the plastic conduit. Using crimping connectors, I connected the plug wires to the red and preexisting black wire of the battery. I also tied a ty-wrap around the cable and tightened it to make sure that nobody would pull the wires from inside the battery by accident.
tell us about the circuit you use...(i couldn't get any detail on text)
Are you referring to the picture of a little circuit board connected to the plug? Like I said the plug originally served to charge a cellular phone but the phone does not work anymore. I assume that the little circuit modifies the voltage in order to charge the phone.

About This Instructable




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