HOW TO REVIVE A NiCd DRILL BATTERY THAT WON’T CHARGE

After owning my cordless drill for more than 11 years, one of the NiCd
batteries wouldn't register on the charger so I thought it was at the end of its cycle life. I was about to recycle the battery and just use the remaining working battery but I managed to get it to accept a charge again.

I didn't re-build the battery, swap cells or anything so it's still in the same overall condition, but now it is recognized by the charger again and I can continue to use it to its normal life limit. This method applies to Nickel Cadmium batteries. If you have a different battery type, you will need to research a different approach.

1 year update: Battery still continues to charge and operate fine.
2 year update: Battery sometimes needs this procedure again, and when it charges it isn't as strong and doesn't hold as long. So I managed to get 2 more years of life out of it rather than having to replace it immediately!

My Craftsman battery model number is 130235030. This may not work for everyone's battery depending what the condition is and the nature of your failure mode, but it works in some cases and is worth a shot.

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