No worries re-charging things like that from the built in socket (assuming the 650 has it, my 800 deos).
Just be aware that the built in socket runs from the canbus, and will switch off five minutes after the ignition. To be honest you're asking for a flat battery if you start charging things with the engine off anyway.
Maplin (for one) do an adaptor for converting from the small built in socket to the more normal car sized one.
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