JNTURK I have the Wildview Xtreme 4 & 5 cams.
As far as batteries I just use generic alkaline C batteries from a local grocery store chain for $3.12 for a pack of 4. I usually change my batteries every 4 or 5 weeks but when I bought my cams I did a test to see how long they would last and I got 7 weeks and 764 pics out of one set.
If you want to go the 12 Volt route just buy the cable off of Ebay for $10.00, you can buy the battery for around $15.00 and a tupperware container for $1.00 to store the battery. Pike