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On Saturday night my telescope and I endured -0.7 degree temperatures. During that night 2 more of my 4 1200mAh batteries died completely. I'm not sure what about it they didn't like enough to completely pack it in, but they did.
I mean die, as in, they will no longer charged at all. No charge remaining and no charging possible.
The canon 750mAh battery went through the same ordeal and still seems fine, but it has had generally less use over the life of my camera than the 1200mAh ones.
Interesting.
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