If it is a Dremel (Division of Bosch) in the USA, for out of warranty, 
they do for around $35 maximum, either repair or send back a refurbished 
or new unit. Caution if you have accessories like router or drill press. 
Some of the newer models won't fit the older accessories. Call them, 
they may have a free adapter. Though I don't consider the Dremel a heavy 
duty tool, it is lower cost, but it's not worth while buying the cheap  
imitations. :(

Vis Naicker wrote:
> Following some recent threads about diy pcbs, I pulled out my dremel-like
> tool from the cupboard, and decided to charge it. It would not charge (
> hardly ever used ), and would not run of the ac/dc charger adapter. So I
> pulled out the screwdriver and pulled it apart, and noticed that the green
> stuff was growing out of one the terminals. I followed it right into the
> motor terminals.
>
> I have not tested the motor much as yet, could this copper corrosion have
> damaged the motors inards? I don't mind the cells as I could always bypass
> it to the adapter or zap them as suggested. The tool is a brand name
> advertised on tv, but it turns out that it is very cheaply built. The AC/DC
> adapter is just that, and I see that it was directly charging the cells -
> there was no charger circuitry.
>
> I will google soon, but what causes the copper corrosion? Could I have lost
> the motor due to the corrosion? Should I open it and try cleaning it with (
> alcohol/silicone/?). Actually I think that is the only option left.
>
>   
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