Does jumping a battery hurt your battery?

Asked By: Zeinebou Ehrhart | Last Updated: 18th May, 2020
Category: automotive road side assistance
4.6/5 (797 Views . 12 Votes)
Any battery or alternator issues that affect power quality will be transmitted to your car. The good news is that large 12v batteries make excellent buffers against power issues that might otherwise cause damage. However, it is still possible to suffer damage to your car from jumping someone elses.

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Beside this, does jumping a car hurt your battery?

No, if done correctly it will not damage either battery. However, there are a few things to note. First if your battery was fully discharged it will have a shorter lifespan due to build-up between cells. Second, if the jump is done incorrectly you can fry computers, fuses or electronics and yes even the batteries.

Beside above, why does my battery spark when I try to jump it? Electrical System Items turned on in the car, such as the radio and clock, might have been turned on before the battery died. This means the electrical system is drawing current, and the battery is part of that system. Sometimes this can cause the battery jumper cable to spark when it's connected to the battery post.

Beside above, can giving someone a jump kill your battery?

NO! You can not kill your cars battery by jump-starting someone else's car, unless your car is not running, and the other car has different issues, (instead of just a low charged battery).

What should you not do when jumping a car?

8 Things You Should Never Ever Do When You Jump Start Your Car

  1. Don't smoke.
  2. Not wearing gloves and eye protection.
  3. Not reading the owner's manual.
  4. Don't jump start the car if the battery is cracked or leaking.
  5. Not putting the car in Park.
  6. Don't let the cables dangle from the car.
  7. Don't use poor and low quality cables.
  8. Lastly, if you're not sure what you're doing - call a professional!

35 Related Question Answers Found

Why don't you connect the negative when jumping a car?

Caution: Don't attach the negative cable to the negative terminal of the weak battery when jumping a car battery! This common mistake could ignite hydrogen gas directly over the battery. Battery explosions can cause serious injury. Finally, remove the positive cable from the car with the weak battery.

Do car batteries charge while idling?

The good news is that yes your car battery will charge when idling. Your alternator produces electricity when your car's engine is running so as long as your car engine is on and your alternator is working properly your car battery will be charged.

What are the signs of a bad battery?

Watch for these five telltale signs of a bad battery so you aren't caught out in the cold!
  • Dim headlights.
  • Clicking sound when you turn the key.
  • Slow crank.
  • Needing to press on the gas pedal to start.
  • Backfiring.

What happens if you reverse jumper cables?

When the jumper cables are incorrectly connected, the polarity of the electrical system on the vehicle with the dead battery will be reversed for a few seconds. This can irreparably damage many of the sensitive electronic components that are common on today's vehicles, such as on-board computers and electronic sensors.

Does revving the engine help jump start?


Is revving the engine a good idea during a jump-start? RAY: So by revving your engine up to 2,000 rpm or 2,500 rpm and holding it there while the other car tries to start, you're increasing the output of your alternator and giving your battery a little bit of extra power, which it can donate to the other car.

How many years do car batteries last?

Under these conditions, you can probably expect your car battery life to be about six years. On average, a car battery lasts between two and five years. If you live in the northern United States, your car battery lifespan will be longer, because you're in a cold climate.

Can a car battery be too dead to jump start?

YES, a car battery can get so dead it will not receive a jump start anymore. To cut to the chase, and just before we get to the meaty stuff, a “deadcar battery is an indicator of different factors—and almost always, these occur all at the same time.

Is it bad to leave jumper cables on too long?

If you are talking about leaving a flat battery connected to a good battery for longish periods, the answer is "it depends". If the engine is running in the vehicle with the good battery, the bad battery will get a charge from that connection, probably not enough to fully charge it, but at least a useful charge.

Does jumping a car hurt your alternator?


Any battery or alternator issues that affect power quality will be transmitted to your car. The good news is that large 12v batteries make excellent buffers against power issues that might otherwise cause damage. However, it is still possible to suffer damage to your car from jumping someone elses.

Does a car battery recharge itself?

A car battery cannot recharge itself. It needs a power source like the vehicle alternator or an external charger to provide capacity to reverse the discharge process. If your alternator is functioning normally, then jump start the vehicle and leave the engine on or drive it for an hour.

What do I do when my car battery dies?

The most common way to deal with a dead battery is by jump-starting it. All you need to jump-start a car is a set of jumper cables and another car (a good Samaritan) with a functional battery. Keep in mind that you should never try to jump-start a car if its battery is cracked and is visibly leaking acid.

What can drain a car battery when the car is off?

The most common causes of parasitic drain are under hood lights, trunk lights, headlights or glove box lights that do not turn off when the door is closed. Relay switches that are stuck in the “on” position can also cause a battery to drain. Alternators with bad diodes can cause battery drain.

Can jumping a car kill your alternator?

In other words, a bad alternator can get your attention by killing your car's battery, even if the battery wasn't the problem to begin with. Simply jump-start your car and then remove the jumper cables as quickly as possible. Then wait.

What happens when you reverse polarity on a car battery?


If you reverse the polarity of the charger to the battery, the battery may explode. It may also cause the battery to stop holding a charge permanently. When this happens, you will have to buy a replacement battery. When a battery is damaged, you need to dispose of it properly, as it could leak acid.

How do you start a dead battery?

Steps to Jump-Start a Car
  1. Park the car you'll use for jump-starting next to the one with the dead battery, positioned close enough so that the cables will reach.
  2. Turn off the ignition on both cars.
  3. First, clamp one end of the positive cable to the dead battery's positive clamp.

What happens if a car battery sparks?

Batteries emit hydrogen gas which is explosive. If you spark the battery, you can cause the battery to explode and that throws acid all over everything including YOU. Hook up the red cable to the positive of the good battery, then the other end of the red cable to the positive of the bad battery.