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@Samuli
I like dynamos, for the simplicity in races and maybe even more so for the winters, as the days are so short here I ride a lot in the dark. But, I got a mountain bike that doesn't have a dynamo recently and it wouldn't really work that well on slow single track. Though I do also have a Exposure Revo that stays bright for a good while after you've stopped or going really slowly, but not sure how it'd work when you're going very slowly for a long time. So I've been using a battery light I already had, but will need to buy something at some point as I don't trust this old light and the batteries are only enough for about one full night, at least now as it's cold. So, shall I buy a new wheel with a dynamo hub to use with the Revo, or something like a Fenix and carry a bunch of spare 18650 batteries in the bag. I'd use it for SRMR, among other things. I'm using Etrex with batteries anyway and a 10 Ah powerbank is plenty for the phone. Both would probably work well and cost about the same, the dynamo wheel and the battery light.