RE: External Battery Box
I know and that has the battery built into it. I put it out in May last year and never had to do anything but get pics till I took it down in November. It worked great"if you get sun"
It is easier then what you want to do and costs the same or less. Plus if you are in a sunny place you wont have to worry about the batterys dieing. I have a 2g chip in mine that hold about 2000 pics so I dont have to mess with it.