It charges while idling but it's much safer for the battery to just go get a battery charger and leave that on there for a while. But it might charge faster if you drive it around than if you let it idle...
It wouldn't benefit me though since my dead battery comes from a fog light I leave on (4th time in 10 years). And my car is garaged at night on top of that... we need it first thing in the morning.
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