If all you had was a “click” I’d drive at least an hour. A quick … The longer you leave it, the more likely the battery … If you only need “just one start", you shouldn't have to run the engine for long. My car has been off the road for quite some time. Charging your car battery with a 2 amp car battery charger will take a reasonably long time, up to 24 hours to reach an acceptable charge, this is determined by the fact that your car battery is usually 48 amps and it takes about 1 amp charge per hour on average. A trickle charger is a great option if you are going to leave your car in the garage for extended periods of time. Sometimes its best to rev the engine and leave it revving for a little while too. Battery life is tough to predict – it depends on the age of the battery, the climate and how often you drive, Brown-Harrison says. A car battery should last about six years, but like most car parts, that all depends on how you treat it. Said car battery is charged at the same rate, wether running at 500 RPM or 10,000 RPM. This means that it can replace 1.5 to 2 amps per hour in the battery that was used up. A typical mid-size car battery will run from 50 AH (amp hours) to 75 AH. Typically a “trickle charger” will run at about 1.5 to 2 amps. This will help to prolong your battery life and maintain its charging capability. For that reason, understanding how long to recharge car battery after jump is very vital. If the starter was just turning over the engine too slowly, a half hour of driving will probably do it. I believe the most common amperage for charging batteries is ~20A at 12.4V or 248 Watts / 1/3Hp drained from engine power. Charging time depends on the battery’s capacity but it is not safe to leave the battery charging for a long time. – tuskiomi May 17 '17 at 18:06 How Long Does It Take To Charge A Car Battery With A Trickle Charge? As facade says at idle you do need to let it run for a long while or you actually end up with a battery that has very little charge. It depends on how badly depleted your battery was. Start your engine up regularly and leave the car running for a little while (make sure you stay in the vehicle). Additionally, one should leave the car running for some time before shutting it down to be sure that the battery has recharged fully. The answer entirely depends on the type of charger you use. How Long to Leave a Trickle Charger on a Battery for a Full Charge? Do this every few days if you can. As others have said there are many variables/unknowns in your scenario. It runs great, but the battery died, i jumped started it, let it run about 10-15 minutes, the inspection is up so i cant run the car on the road, but i did drive it around my parking lot for a few minutes. My car battery is dead, how long should i let my car run to charge the battery? 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