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So you're talking about an adapter that takes only one AA battery? If so, I bet your camera will last a much shorter time period than it does with the D batteries. The AA's just have a lot less capacity, because, obviously, they are much smaller.Maybe you should try the adapters that take three AA batteries.http://www.batteryjunction.com/titanium-3aa1d-par-adapter.html
If memory serves me a C and AA are same length but a D is longer.
And the length is relevant how?