Dewalt cordless drill battery charger will not allow the battery to charge
When I place the 9V Sears dewalt cordless drill battery into the charger the evaluating light stays on and the battery will not take a charge. If I lift the battery out of the hole just a little bit and the evaluating light does not go on then the battery will charge. The problem is that the battery needs to be propped up very carefully and a spacer added to keep the battery from falling completely into the hole and this takes just the right tough. Many times I return to check the battery and the eval light is on and no charge. So I start again. Can the eval system be disabled?
I don't know if the evaluation system can be disabled or not, but if it's still in warranty you will certainly disable that if you take it apart. If it's not in warranty any more, then given the amount of trouble you have getting it to charge I'd certainly take it apart and try cutting the lines that go to the light. Maybe they are the ones that run the eval. system. Be careful when you do cut them as you could probably hook them back up if that isn't what you need done. In the meanwhile you could start watching on www.battery-replacement.org for a replacement battery charger. They can usually be had fairly cheap. And as a last resort, you could do as I do with my 12 volt batteries. I simply attach, usually by clamp, a couple of small bolts, to the contacts for charging the batt's, and then hook up my 12 volt car battery charger. 12 volts is 12 volts, no matter what charger is delivering it, so this works just fine. I've gone through several chargers that came with different battery tools, and I'm still charging the batteries with a car charger that I've had for over 10 years. The fact that it's 12 volts, simply means that the batteries will charge faster than the regular 9 volt charger. You'll have to keep an eye on them. I'd try 20 min's. as a place to start, if they don't seem charged enough at that, make the next charge a little longer, maybe 30 min's. Eventually you'll find the right combination.
Maybe I can Unplug the charger. Use rubbing alcohol and clean the contacts on the battery and charger. Does it happen with both batteries? If so then you probably have a bad charger. If its just one battery then that battery is bad. There isn't any way to disable the evaluation process most chargers check the battery when you first insert it