Does A Car Battery Charge At Idle, Or Does The Engine Need To Be At Higher RPMs

Finally got my range rover started, left it idling for about 40 minutes, drove it around for about 15, and tried to start it — barely started. Battery was completely dead before the jump. Now I’m going to leave it idling for a few hours, will that effectively charge the battery, or should I just head to kragen for a battery charger?

Battery was replaced about a year ago, so I don’t think I need another one.

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