billcurry: The Wild View camera uses 4 each "C" batteries rated at 1.5 volt each. There for 4 batteries times 1.5 volt equals a total of six volt. By using the 12 volt battery and the resistor which only permits 6 volt actually entering the operating system of your camera you have double the battery storage capacity. WildView has this already built in. On the bottom of the camera you will see the 12 volt port for a barrel type plug. Center of the plug is positive.
Another thing to look at: I am going to name Energizer 12 volt as this is what I have been using. This brand of battery comes in 160, 200 and 300 series. The higher the number refers to cranking amps. So if one used say the 300 series (300 cranking amps) for starting an engine it has more power (reserve capacity) than say the 160 or 200. The higher cranking amps the more pricey the battery. Using the 12 volt battery in colder weather, your camera will still keep working longer than using the "C" batteries. Cold weather is very hard on smaller batteries as they don't put out the same voltage. As an example, leave a flash light out in a vehicle in winter over night, then turn it on the next morning. The light will be very dim. Now that we are into summer, put the flash light in the deep freeze or refrigerator for a little while. The longer it is left in the cold, the dimmer the light. When checking my camera, I always carry a digital multimeter to check the "C" batteries or the 12 volt battery if I am using it. One can also buy "C" rechargeable batteries rated at 1.5 volt and the charger at most Wal Mart stores. The charge is good for "AAA", "AA", "C", "D" and it also has a 9 volt port. The charger is good for Nickel Hydride and also Alkaline batteries. Just don't mix them when charging. The batteries go under the name of "Pure Energy". I am testing the "C" batteries at present in my Wild View. I don't know how they will stand up in cold weather. I am using Pure Energy "AA" in my 2009 Bushnell Trophy Camera with good success for the last couple of months. For cold weather, if these don't stand up I'll use the Energizer Ultimate Lithium. These are not rechargeable.
As to your question on how many pictures, this will depend on: (1) how much animal activity you have, (2) vegetation movement caused by wind, rain or snow depending on the season, (3) the size of SD card- 512 Mb, 1 GB or 2GB and the length of time before the camera is rechecked. Wild View will accept these three sizes and I have used the following brands: SanDisk and Lexar.
I also put a piece of 3/8" or 1/2" plywood, cut to the size of the base of the battery under it. This way the battery will not freeze to the ground and can be removed with out damaging it. Also when storing any battery do not place it directly on cement. For whatever reason a battery stored on cement will die in a very short time. Put ply wood, a piece of wood (2x4, 2x6) etc. under it or set it up on a wood bench or shelf.
One member on another forum also mentioned, the wire going from the 12 volt battery to the camera, if you have squirrels in the area, to make a paste of cayenne pepper and rub it on the wiring. Squirrels love to chew on things. Personally I had not used this. What I did was put some small branches over the wire for a distraction. I do not know if the smell would bother animals you are trying to get pictures of. Good luck.