ORIGINAL: twoslick2
What about a car battery charger? Won't that work?
Generaly, a big fat NO. There is insufficient filtering on most car battery chargers.
As to fires when you modify the computer power supplies, very little chance of a problem. There are a number of sites on the web giving you step by step instructions on how to make the modifications, just google for them. Most will make nice power supply s for your charger.