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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@Moonboy
T.O take a look at the various products from Goal Zero and Powertraveller . Both have solar chargers with power storage incorporated (or seperate) so you can charge the battery during the day but also charge your device at the same time. You can also charge the battery from the mains. In the £60 to £80 price range.