FIELD: transportation.;SUBSTANCE: invention relates to charging vehicles. Method of charging a vehicle comprises controlling DC converter output voltage via a control device, while connected to an external electric source such that zero current flows to and from an auxiliary battery in response to a state of charge of the auxiliary battery exceeding a threshold. Otherwise, the DC converter output voltage is controlled to flow current to the auxiliary battery.;EFFECT: improved protection of the power storage device.;20 cl, 5 dwg
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