How Long To Run Vehicle To Charge Battery. OK so if youre starting it with the main aim of charging the battery you want to start it and hold it at a high idle maybe 1500rpm to get the alternator working with no other loads so no ac no lights etc that should put a good amount of charge back into the battery in 5 mins. The most common rate for car battery chargers is around 4 amps.
Keep in mind that a battery charges costs around 70 while a replacement alternator costs around 500 to as much as 1000 with installation. An electric laptop can run for five hours on 45 watts. Generally it will take 2 to 4 hours to fully charge a car battery with a 20 Amp battery charger and 12 to 24 hours with a 4 Amp charger.
However there is an answer that will work in almost all.
If you use an external charger you will take more time to charge. Before asking how long it takes to charge a car battery we have to look at the methods designed to make the charging process as quick and smooth as possible. Whenever you run your vehicle you need to completely warm up the car through driving. It will safely charge the battery whenever the battery level drops.
