one good battery or a few cheap ones?

i'm in need of more than the one battery i have for an upcoming shoot...we'll be shooting outdoors in rather cold weather, but i will have a genny so i can be charging the batteries throughout. whats the call...a couple of cheapos on ebay or what appears to be double the price of those two combined for the 5600? thanks.
 
I wouldn't buy batteries on ebay, because they do get depleted over time. Get them from a trusted source and get fresh batteries.
 
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