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This article was co-written by Andrew Quinn. Andrew Quinn is the principal mechanic in Missouri. He is ASE certified and has been repairing cars since 2010.
This article has been viewed 9,287 times.
There are many reasons why a car battery dies, such as leaving the car too long without starting, leaving the battery in the cold outside, leaving the lights on overnight when the car engine is not running and so on. To recharge a dead battery, you need an external set of starter cables and another well-functioning car. You would then connect the batteries with an external starter cable, and transfer power from that vehicle to charge the dead battery. Continue reading the article below to know how to safely and effectively charge a dead battery.
Steps
Before charging the battery
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Check the external condition of the battery before charging. The battery must be intact, not cracked and no acid leaking out.
- Do not attempt to charge the battery if it shows signs of damage, as you may cause injury to yourself or others.
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Wear safety goggles and rubber gloves before touching a dead battery. Goggles and gloves help protect your eyes and hands from the acid from the battery.
Check to make sure the cables connecting to the vehicle’s battery are tight and free of corrosion.
- If the cable connecting to the battery is corroded, clean it with a wire brush.
Drive the bait vehicle to a position next to the vehicle with the dead battery but do not let the two cars touch each other. The ideal location to charge the battery is to place the two cars side by side and facing the same direction, or place the two cars facing each other.
- Check to make sure the distance between the two batteries is close enough to allow connection with the starter cable. The length of the starter cable is not the same as it depends on the cable model and manufacturer.
- Do not attempt to connect two sets of different cables together if the first set is not long enough. This may cause the cable to melt and catch fire.
Turn off the car engine with the battery in good working order.
Activate dead battery
Open the bonnet or battery compartment.
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Note the positive and negative terminals on each battery. The positive terminal will be denoted by a plus sign (+), and the negative terminal will be denoted by a minus sign (-).
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Connect the ends of the positive starter cable to the positive electrode on the two batteries. The positive starter cable is usually red if not otherwise marked. The sequence of connecting the starter cable makes a difference , so you need to do the following: First, connect one end of the positive cable to the dead battery, then connect the other end of the cable to the battery. primer battery.
Connect one end of the negative starter cable to the negative electrode on the primer battery. Usually the negative start cable will be black.
Connect the other end of the negative cable to a metal (grounded) part located on the vehicle with the dead battery. This step helps ground the vehicle with a dead battery when the vehicle is started. You can attach the cable end to the chassis, chassis or other part that is relatively clean, not painted or rusted.
Start the bait car. When starting the engine, the vehicle’s charging system begins to transfer electricity to the dead battery through the starter cable.
Wait a minimum of five minutes after starting the bait vehicle. This time allows a dead battery to build up, although you may need to wait longer to fully charge it.
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Start a vehicle with a dead battery. If the battery is fully charged, the car’s engine will easily restart.
- If the car engine cannot start, you should wait another five minutes for the dead battery to accumulate more power.
After the car engine has started, disconnect and remove the starter cable in the reverse order of connection . This will prevent electrical discharge or fire.
- Disconnect the ground cable first, then the cable that connects to the negative electrode on the battery, then the cable that connects to the positive electrode on the car battery, and finally the cable to the power positive pole on the battery is charged.
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Let the vehicle that is charging the battery continue to run for a minimum of five minutes. This time helps the generator in the car to recharge the battery.
Operate the vehicle for at least 20 minutes (drive or stand still). In some cases, the battery will be fully charged during this time, but you may have to buy a new battery if the old one cannot charge enough to start the car.
Advice
- Pay attention to the vehicle temperature when leaving the vehicle in place for a long time, as some vehicles can overheat when standing still for too long.
- Auto parts stores can do a quick check to determine if the battery is still working.
- Some Ford vehicles have voltage shock when starting this way. To avoid electrical damage, be sure to turn on the car heating system to the fastest fan speed, and turn on the windshield heater. If there is a voltage shock, the fan fuse will blow, so opening the fan/heating will help absorb the excess voltage. [1] X Research Sources .
- The larger the copper core diameter of the starter cable, the faster the charging time.
- Check the electrolyte solution in the dead battery to make sure the compartments have enough fluid.
- If you want to diagnose a battery problem, you should first check the battery load.
Warning
- Never let the positive and negative ends of the starter cable touch each other while connecting to the battery, especially when you are working. If you let them touch each other, the cables can melt, damage the battery, or even cause an explosion.
- Recharging the battery may release explosive hydrogen gas.
- If your car has a manual transmission, be careful with the clutch.
Things you need
- Goggles
- Rubber gloves
- External start cable
X
This article was co-written by Andrew Quinn. Andrew Quinn is the principal mechanic in Missouri. He is ASE certified and has been repairing cars since 2010.
This article has been viewed 9,287 times.
There are many reasons why a car battery dies, such as leaving the car too long without starting, leaving the battery in the cold outside, leaving the lights on overnight when the car engine is not running and so on. To recharge a dead battery, you need an external set of starter cables and another well-functioning car. You would then connect the batteries with an external starter cable, and transfer power from that vehicle to charge the dead battery. Continue reading the article below to know how to safely and effectively charge a dead battery.
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