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Does the underground car park have any natural light close to where you park your car ?
If so, you could get a solar panel charger, and possibly extend the wire so that it reaches your car / battery.
There are several available for caravans / boats, that might do the job.
If so, you could get a solar panel charger, and possibly extend the wire so that it reaches your car / battery.
There are several available for caravans / boats, that might do the job.
