yeah try and get a spare battery or charger , I left my charger on a shoot 2 hrs away from my house. and didnt realize till later. Looked around local places and online. next to impossible and $$$ too.
Spare batteries and lots of CF cards. I actually bought two chargers and also an adapter so that I can charge batteries while on the road in the car driving. Though I have to say that it doesn't consume that much. I have 3 batteries for mine and that has always worked out fine. I thought video would consume more than it does. (But that's pobably because shooting requires good planning with a 5D2 so you just simply don't have the camera rolling as much as a "normal" video camera I think. Planning shots is essential to get someting good of this great camera I think. Long 300-400mm with lotsof IS activity seems to be the worst in terms of battery consumtion.
I did the upgrade over the weekend and it is truely amazing. Thank goodness I did not invest in a bunch of Nikon lenses to do the workaround. For the image quality it is well worth any slight headaches in workflow dealing with the files.
I had Canon for many years, then 3 years ago I went Nikon and D2Xs etc, wasn't really happy, too ISO-noisy and other things. The
Bought the 5D, got happy again... the the 5DII. And truly wonderful stills! And got a great videocamera for free at the same time. The concept and basic idea is really strange and weird - but it works, it's a very creative tool.
Nikon and D2Xs work in difficult conditions, but the canon 5DII is a very interesting camera. With the latest Canon firm update, I'm adding it to my list of "must" haves.