Anonymous wrote:I had a completely dead battery and 30 minutes of driving (20 highway plus 10 local) was not enough to revive it. I couldn’t restart the car after turning the engine off. So in my case I needed to drive another hour.

or you battery just was not able to take a charge and it needed to be replaced. or something else is going on in your cars electrical system.

Anonymous wrote:I let my car sit for a while and now I have a dead battery. Once I get the car jump started, how long do I have to drive around for to get the battery charged back up? I have looked online and gotten answers from 30 minutes to 10 hours on the freeway. Anyone have any IRL experience with this?

30 minutes is the standard advice. However, depending upon the car brand, year, and model, you may have to get a trickle charger and attach to your car battery each night (or whenever not in use). Many cars constantly drain/use the battery even when parked in one's garage. Accordingly,your choice is to either get a trickle charger or to buy a new replacement battery.