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  • ^^^ I don't think there are any proper lights that don't have external batteries (other than dynamo setups). Sticking the pack in a bar bag, under the stem or TT or in a cut water bottle are the usual ways. I've run the cable along the TT to a saddlebag before.

    Propriety external battery packs allow you to replace knackered old batteries cheaply. I replaced a 4 cell unit with a 6 cell when the the original died (3 or so years from new). I get 12hrs at low (depending on temperature) and around 3hrs at full beam (which is a claimed 900 lumens).

    I leave it on the (unlocked) bike each end on my commute, the rest of the time it's not a problem – again I'm out in the countryside and people aren't quite so desperate for each other's property. :)

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