On Fri, 25 Aug 2006 23:53:51 GMT, "The Medway Handyman"
wrote:

I chesked out http://www.cybermarket.co.uk/ishop/923/shopscr98.html

They have Modified Sine Wave Inverters , Pure Sine Wave Inverters and
Combined Inverter & Chargers - brain gone numb. No idea of which they
speak.

I checked out TLC and they have just plain inverters - but the cheapest is
aroud £23.

I'd only expect to pay a £5 -£10 for an in car charger for a phone or
whatever. Is an inverter overkill?

Does the drill have a standard DC socket? If so why not make a lead.

Just use a cigar lighter plug, DC power plug lead and a power resistor
to drop the voltage and regulate the current.

These drill usually have 1Ah batts, so a lead with a 3 ohm resistor
will drop ~9v at 300mA, for a charge time of 3-4 hours.

You need to find out the polarity of the mains charger plug, this can
be done with a cheap DMM.

Also a word of warning, get a 10W power resistor and superglue it to a
plate of ali or small heatsink. Without this they get very very hot!

With a cigar plug with screw terminals and a ceramic terminal block or
two, you won't need to do any soldering. Add a 12v LED or small bulb
across the resistor to remind you it's on charge.

Don't leave it on charge for longer than needed, as the life of the
batts will be shortened.

If this is too much hassle just get a cheap one that takes rechargable
AAs and use as a backup...

cheers,
Pete.