Dave I've been using cordless batteries for 20 years. Tried zapping them, putting them in the freezer...nothing works.
The nature of the battery is the problem. I've learned that NiCd batteries don't last more than a few years. They self-discharge about 1%/day. Each time you recharge, you never get them up to 100% full charge.
Tried Lithium batteries about 4 years ago. They are lighter in weight, however they are beginning to die.
So far the best battery is a Nickel-Metal. All my tools are 18v Dewalts. I use them every day. At the time Dewalt didn't make a Ni-Mh battery, so I found it on Ebay. It is as strong as the day I got it. It is so strong, that the cordless sawsall will shake it apart. I've had to take the battery apart and solder it back together.
My advice to you is get a better battery and a charger that will shut off when the battery is charged. The chargers needed for Lithium and Nickel Metal will turn off and the battery won't get cooked on the charger.
I've found ebay to be the best place to shop around for good batteries and chargers. STAY AWAY FROM NI-CD BATTERIES.
Were you able to charge a dead 6v battery by jumping it with a good 6v before you put it on the charger?
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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