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The advantage of these batteries is that they can sit for up to a year and hold their charge, so when you go to your camera bag and get these batteries for your flash they are charged and ready to go - even if you put them in your bag six months ago.
I discovered these batteries when I was researching the field photo storage project I am working on. (More about the photo storage project later.)
The project required an emergency backup power pack that could charge from a USB port. By the way, it's great for cell phone emergencies and for point-and-shoot cameras that run out of juice in the field and you do not have another camera battery.
Below, continue to the fun at the Museum of the Obvious:
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