If there is nothing identifying the specs, open it up and see if the circuitboard has anything written on it. Check the outputs with a multimeter and match up to an appliance - i.e. volts, polarity, amps, etc.
@bq started
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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If there is nothing identifying the specs, open it up and see if the circuitboard has anything written on it. Check the outputs with a multimeter and match up to an appliance - i.e. volts, polarity, amps, etc.