How Long Should U Charge A Car Battery. If your car started after you did a jumpstart you would have to let it run for a few minutes to charge the car battery further. To boost your battery enough to be able to start the engine it would take around 2-4 hours.

It means that a high capacity charger would merely take 4-5 minutes to fill the battery. Another important point not to miss is the capacity of the battery you are charging. Thats the simplified answer to give you a ballpark estimate.
Larger vehicle batteries can be charged in 50 hours at 2 amps or 10 hours at 10 amps.
You have to drive your car for about thirty minutes. The first time you charge a new battery it will take significantly longer than subsequent charges. If your car started after you did a jumpstart you would have to let it run for a few minutes to charge the car battery further. You have to drive your car for about thirty minutes.

