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Jan
You can do this for about an hour before raising the charging amperage. Realistically speaking a flat battery can be charged up to 80 percent in 2 hours.
After that connect one end of the other cable to the negative terminal of the donor battery then connect the other end of the cable to bare metal on the engine or the frame of the vehicle.
How long should you charge a dead car battery. It takes between 4 to 24 hours to fully charge a totally dead car battery depending on how many Amperes your car battery charger is charging with and your car batterys size. The most common rate for car battery chargers is around 4 amps. The amperage rating of the battery charger will help determine how fast the battery can be recharged.
For example if you had a 10-amp battery charger it would take roughly 5- hours to recharge. Lets explore this relationship of depth-of-discharge and recharge rates in more detail. It is quite difficult to figure out the charging time of a dead car battery.
Dead car battery means it is highly discharged. That means it will take a longer period to recharge. A car battery normally takes 8 hours for 100 charging.
But if it severely discharged then that charging time can extend up to 12-14 hours. 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. However always be prepared to leave the charger on overnight in case it takes longer than expected.
At least 30 minutes of driving will help charge the battery back to a safe level for your next start. Below 12 Volts Use a Dedicated Charger Your vehicles alternator can keep a healthy battery charged but it was never designed to completely recharge a dead car battery if the unit in question reads below 12 volts. Realistically speaking a flat battery can be charged up to 80 percent in 2 hours.
But to make this possible the alternator has to manage 14 volts at the battery terminals the whole time it is being charged. It is also important for people to realize that cars are not meant to be kept idle. Plug in charger - Plug the charger in and follow the manufacturers recommendations on how to charge the battery.
Most chargers will do this automatically. If yours is not automatic make sure that you start off with a slow charge at approximately 2 amps. You can do this for about an hour before raising the charging amperage.
Automobile batteries commonly have a capacity of 48 amp hours. This means that it can deliver 1 amp per 48 hours or 2 amps in 24 hours 8 amps in 6 hours and so on. So a 2 amp charger will deliver 2 amp per hour to this flat battery and if it requires 48 amps that in means it needs 24 hours to fully charge.
The length of time it takes to charge your car battery is completely dependent on the size or amp of your battery and the amp of the car charger you are using. If using a low amp charger it can take up to 24 hours to charge your battery properly but a high amperage charger such as a 40 amp charger will get the job done adequately in an hour or less and will get you on the road again in only a few minutes. After that connect one end of the other cable to the negative terminal of the donor battery then connect the other end of the cable to bare metal on the engine or the frame of the vehicle.
From dead fully discharged it would take a small car battery about 25 hours a larger car or small SUV battery 32 hours or a larger SUV and Truck about 48 hours to fully charge on a 2-amp charge. The same batteries could be charged in about 12 hours 16 hours and 24 hours with a 4-amp charge respectively. Your battery will drain faster when its connected to your vehicle than when its disconnected.
When stored properly a detached car battery can last up to six months. Like new batteries the key to making it last is to recharge it regularly. Giving the battery a charge every 12 weeks is a good standard to follow.
If your car battery was manufactured a month ago and has never been previously installed it should be enough to put it on a slow charge for 22-24 hours. After charging put it in a dry and warm place with low humidity for example in a closet. Repeat the charging process every 2 months until you plan to use it again.
Many battery chargers deliver two to six amps some allow you to choose the amperage level and will take at least several hours to recharge a dead car battery. Read the instructions that come with. The average car battery will provide about 48 amp hours before it is depleted of power and a 40 amp battery charger would restore that number of amp hours in an hour or less.
There are some real drawbacks to having a 40 amp car charger. The goal of this article is to show you how to revive a dead car battery before having to purchase a brand new expensive battery or alternator. If you have already tried to jump your car and it.
Upon starting the engine its charging system will begin to charge the dead car battery through the jumper cables. 7 Allow at least five minutes to pass after starting the engine of the car with the charged battery. This will allow the dead battery to build up a charge of its own although it would take longer to fully charge the battery.
How to charge a car battery depends on how dead the battery is. Its important to know just how dead your cars battery is before you decide how to recharge it. A healthy battery will show 124 to 127 volts across both terminals when measured with a voltmeter a handy device for diagnosing battery issues.