How Long A Car Battery Last Without Alternator. Replacement batteries may come with a rating for expected mileage andor years. At idle the battery can take around 2 hours to charge up to 80 complete if it was flat and the alternator can generate.
So how long will your car run without the alternator depends on the power remaining in your car battery. First battery lasted close to 2 hours stopped for gas wouldnt crank up after fill-up put in other battery made it to the house. At most you should get around 5 to 10 minutes of driving before.
If for instance you keep your engine RPM high the alternator will charge your battery faster.
You can run a vehicle on battery alone for around 5-30 minutes if the battery doesnt have a full charge. For old models the vehicle can run up to 50 miles. At most you should get around 5 to 10 minutes of driving before. How Long Do Car Batteries Last.
