What size external battery do you use for a moultrie d40 game camera?

I have a moultrie model d40 game camera that normally uses 6 or 8 d size batteries. They don't last long and I was wanting to purchase a 6volt or 12volt rechargeable battery. But, the manual doesn't say which volt to use. However the camera does have an external power plug-in port. So, which is it? 6 or 12 volt? And where can I find the cord to use with the camera?What size external battery do you use for a moultrie d40 game camera?Best would be to ask someone like Batteries Plus to build a battery pack for you that follows the voltage requirements... Might have a store near where you live... worth checking with them. ( http://www.batteriesplus.com )

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