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[[File:Vmu_mod_cord.jpg|thumb|An extension cord for an AC adapter]]
To do this mod right, you should attempt to track down a cord similar to the one pictured to the side. What it is is an extension cord that takes a cylindrical AC adapter's cord and splits it into two wires. What this cord will enable you to do is solder the female end to the VMU and use the male ends to modify a battery pack or AC adapter (if necessary) so they can plug into the female end. This will allow you to detach your new power supply from the VMU when you're not using it and to switch between AC power and battery power as you please.
If you decide to use an AC adapter with this cord, you should first identify its polarity (see above) and then use a voltmeter on the extension cord to figure out which wire corresponds to which part of the plug. This is so that when you solder the female end to the VMU you will not mix up positive and negative. If you're only using a battery pack, you can choose your polarity; just make sure you're consistent with both the female end (VMU side) and male end (battery side).
==Step 2 - Solder the wires==
Once you've decided on a power supply and you've identified which end of it is positive and which is ground, it's time solder. Flip over the VMU and remove the battery cover and the two CR2032 batteries to expose the battery terminals. The large blade on the bottom is the negative end and the small blade off to the side is the positive end (see pictures below).
All you need to do is solder the wires of your power supply to the correct terminals of the VMU. If you're going to directly attach the supply to the VMU, make sure you give yourself plenty of cord length. If you use an extension cord to create a detachable plug, make it just long enough so that the thick end of the cord won't interfere with plugging the VMU into the first slot of a controller with something else in the second slot. With this mod, you will not be able to attach the VMU to the second slot any longer.
<gallery spacing="small">
Vmu mod batteries removed.jpg
Vmu mod wires connected.jpg
</gallery>
