Anyone build an external power supply for their game camera?

I have a wildview xtreme 3, and I need to make it use a 12v power supply because it eats through batteries too quickly. Wildview sells a 12v kit, but it's $50. I figure I should be able to build one for a lot less. My plan consists of the following:

- 12v SLA Battery: $16
- Ammo can
- some caulk
- trickle Charger
- heavy duty plastic bag with zip tie (extra weatherproofing)


What I'm missing is the wiring. I don't know exactly what I need to run between the battery and the camera. There is a 12v plug on the camera, but I don't know what size to get. I should be able to solder/clip/rig wire to the battery terminals and then splice that with the plug.... I just don't know what size plug to look for. Anyone who might have done this, please let me know. I have everything I need to do this except the plug and the battery. So I figure for $20 I can have the whole setup, and it will likely be more weather proof than the $50 version that the manufacturer sells.

I just need to know what size connector I need out of these: http://www.partsexpress.com/webpage.cfm?webpage_id=3&SO=2&CATID=21&ObjectGroup_ID=114

For anyone who is interested in the same idea, here is a very good post detailing this person's solution: http://www.chasingame.com/forum/viewtopic.php?f=12&t=2499&hilit=wildview+battery

For my camera it's a radio shack type 'M' connector that fits.

Thanks, I've heard of rigging them up, but usually I saw them in the $40 price range, and am skeptical as to how well they might work in the woods. For $10 it sounds like it might be worth a try even if it just extends the battery life a week or two.