How Long Does An Alternator Take To Charge A Battery. Depending on the age of your battery the capacity and construction of the charger and the charging technique used it may take a few hours to reach a complete charge. When your car engine runs your car alternator may take more or less half-hour to recharge the battery fully.
As long as the battery voltage rises when the engine is running you know that your alternator is working. The most common rate for car battery chargers is around 4 amps. If the vehicle continues to run your alternator is properly charging the battery.
A totally defective alternator wont charge the car at all when youre driving.
The length of time that it takes depends on several things but is usually between 15 and 60 minutes. The alternator charges the battery while the car runs so you can try charging the battery this way if you dont have access to a charger as long as the car can be started. WHAT MAKES THE TIME VARY. Conventional lead acid batteries will take longer as they are unable to speedily absorb the charge.
