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The batteries have worn out for your drill and can no longer be charged anymore and you will need new batteries also. Or there might be something wrong with the charger as well.
The charger is a 24v 4 amp one stage device. Its an incredibly cheap charger. It consists of a step down transformer, a bridge rectifier, a filer capacitor, and a voltage regulator. Virtually all chargers are made this way. Generic schematics
I would get out my trusty multimeter and chase 24v though the device.
You may need a VOM meter only $9
http://www.amazon.com/Mastech-YG188-Pocket-size-analog-multimeter/dp/B00064CH6A/ref=sr_1_8?s=hi&ie=UTF8&qid=1339024102&sr=1-8
Set the meter to read VAC, you should get 30VAC out of the transformer. Next check the rectifier section, Set the meter to read VDC, the output should be about 29VDC. There is a fuse in there that you can check out. Then there is the regulator, if any part of that is fried, you're going to have a hard time finding parts. i really miss the 60's when there were electronic stores on every corner. There used to be a time when you could order your your TV as a kit. You could literally teach your kids something useful at the kitchen table. Quite frankly a 2 amp charger cost $14 4 amp cost $28. Not worth fixing really.
Chargers can be found here http://www.amazon.com/Electric-Scooter-Battery-Charger-Prong/dp/B001GMTKN4
Power supply for the VP130 is a 4.32v 210ma AC transformer.
The AC supply is fed to the charger battery box where there are two diodes one for each battery. each battery is 3.6 volts.
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