EOS 7i Charger

[BrianG]

The RadioShack power supply will only work for up to about 40 watts. On the picture, I can see "3/5 Amp". I presume it means it can supply 3A continuous and 5A peaks. You would need a power supply capable of about 150W to be able to fully utilize the 7i charger (it's rated up to 120w).

That PC power supply in MM's link will be about the best thing you'll get for the price. You just have to connect the green wire in the motherboard connector to a ground wire to turn it on.