| > Once in a while I need a 12v source at the work bench and I know I could 
> simply  tap a battery, but I'm looking for something I could simply 
> "switch on" at the work bench. Nothing I can imagine right now would 
> require major amps.  I was wondering if I could use a battery charger as 
> a power source, or is there a better solution.
If it were me, my first choice would be to search ebay or a used 
electronics store for a variable voltage DC power supply (You may want 
to do other things with it).  Second choice would be new one from an 
electronics store.  Third choice is to buy a transformer, fuse, switch, 
some diodes and large capacitors and assemble one.  A 12V power supply 
is one of the easiest projects you can build.  My first one was in 7th 
grade science club.
TeriAnn
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