You can use a dimmer switch to power up a 10 amp battery charger and by using the dimmer keep it under 10 amps this way you won't burn up the charger. If you do use the charger with out the dimmer switch it will pop a thermal fuse built into the chargers coil under the insulation a couple of wraps it can be replaced by buying the part a radio shack. Most people don't know this and throw away the charger. Be careful when using this device as it will knock the hello out of you and could kill you. Also be careful hydrogen gas and chlorine gas can come off in the process and some of the other stuff I've ran into will leave a very corrosive dust in the air so be careful.
Good find and nice post I know about this and have in the past used it. I've not posted about this because of some of the nasty things that can happen.

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norms-iron-works.tripod.com
motor assisted bicycle engine headlights that work off of your white power wire. check it out