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frank9755
Unfortunately you didn't answer the question. I just wanted to know if a battery requires 0.5kwH or whatever to charge from your home supply and that costs 2p or whatever, how far you'd need to ride to generate the same money's worth of electricity. Nothing to do with cost of either device - clearly the Li-Ions have leaked into your food supply :P
The convenience of my dynamo power is worth far more to me than £s. For that, you'd have to ask "how expensive would a dynamo setup need to be before I wouldn't use one?".