Friend took a couple of those with him on the Tour Divide, rated them highly.
Batteries in Exposure can be replaced too if you think original unit has lost capacity.
You mean these? http://www.exposurelights.com/cycle-lights/batteries-and-chargers/support-cells
Yes, he took those, unsure which capacity but I'm probably going to see him at the pub later in the week if you have any specific questions.
You can also get the light's internal battery replaced by Exposure (or there is a DIY guide to do it somewhere...)
@amey started
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Friend took a couple of those with him on the Tour Divide, rated them highly.
Batteries in Exposure can be replaced too if you think original unit has lost capacity.