Don't throw that out, Save some green and improvise!!!
Hey!!!! Don't throw that old cordless drill or saw away!!! Remember when you decided to go to 18 volt battery powered drills because the 14.4 volt wasn't strong enough and it didn't hold a charge long enough for more than 3 screws? Let me tell you something. You dont need to go out and buy a new drill or whatever power tool you own. This advise will help you with your portable business that takes the use of your cordless power tools, and it will cut the costs of electricity at your own house. Believe me, it works wonders and lasts as long as your car battery does.
I had an old 14.4 volt cordless drill, one that had the 2 speed switch and a vairiable speed trigger. As usual the batery or the charger, which ever it was finaly died and I did not have a drill anymore. I looked at prices for a new battery, and honestly, it was almost the same price as buying a new drill!!! Outrages!!! Anyhow, I went back home disapointed thinking of ways to get my drill's battery packs to take a charge again.... No luck on getting them to hold a charge ever again, so, I improvised. I had an almost new car battery sitting in the storage closet of my house. Just as a test, I checked to see which slot in the drill (where the battery goes) what positive. With some extra research, I found out that about 90% of cordless power tools' positive side is the right side (with the drill upside down and the nose facing toward you). Back to not throwing those cordless tools away or buying new batteries for them. Take an old extension cord and and cut the female end off of it. Plug the male end of it into the part where your battery went and wrap it with duct tape to make sure it stays there. Strip the wires and find out which is + and which is -. If they are backwards it will feed back into the battery and the drill wont turn. Once that is correct, mark the wires with + and - on a piece of masking tape wrapped on the wires. Once you finished all that, get yourself one of those ciggarette lighter plug ins' that plug into your car, or 2 small jumper clamps. I used the jumper clamps. Just match the +'s and the -'s with each other and TAH-DAH, you now have a 12 volt power tool that runs off of your car battery.
Once all of that is completed experiment with it a little bit to see what you can do to make it easier for yourself and using your new 12 volt power tool