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Does it really kill your car battery to jump someone else's car?


I heard that you may be doing harm to your own car's battery by helping someone jump start their car. Is this true? Why would that be the case?

 

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Luis E Gonzalez (LuisEGonzalez) says

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6 years ago
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  • Joel Mauldin profile image

    Joel Mauldin 3 years ago

    Some of this is not true. The ground of your car is directly connected to the ground of your battery. There is virtually no difference between connecting to the ground of your car or the battery terminal. Run the car engine to avoid "feedback".


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Mike Pugh (CloudExplorer) says

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6 years ago
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  • Doug Cutler profile image

    Doug Cutler 21 months ago

    I blew the top off one when testing a starter from another car.

    My car was running and charger my battery when I put the starter next to it and jumped the starter. It sparked and exploded the hydrogen that was accumulated in the battery..

    Now I wait!


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Richard Brown (richardbrown81) says

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4 years ago
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2 years ago
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BigBlue54 says

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Borsia says

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  • Doug Cutler profile image

    Doug Cutler 2 months ago

    I agree mostly.Two exception is if you had an old 6 volt system. Or like another said a badly shorted battery.

    Or a rare one is if one car has positive ground and the bumpers were touching. B4 the 60's some had this.

5 Ways to Keep Your Battery From Dying When Jumping Someone Else's Car98

5 Ways to Keep Your Battery From Dying When Jumping Someone Else's Car

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someonewhoknows says

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24 months ago
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  • Doug Cutler profile image

    Doug Cutler 21 months ago

    There is an issue about the diodes in the alternator going out it you do it wrong. Like, if you put a good battery in, start engine, leave running, remove good battery, put back in discharged battery. The "no battery time" can damage the diodes.

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  • Shyron E Shenko profile image

    Shyron E Shenko 14 months ago

    Peter, if a car is running and you disconnect the battery then the motor will stop running.


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    Craigrendel 2 years ago

    Thank you. I'm glad somebody finally answered the car battery question correctly. Some people have no clue about their car battery. Engineers only make car batteries 12V or less. This keeps misinformed mechanics from dying from electric shock. LOL

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  • someonewhoknows profile image

    someonewhoknows 4 years ago

    If,your car has a small battery & maybe even a cheap battery and it's one of those economy cars that has little or no accessories that most other cars have then I could see a problem .Your smaller battery & or alternator would not be up to c


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jchaney says

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    Craigrendel 2 years ago

    You couldn't be more wrong. Too bad.

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Huntgoddess says

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2 years ago
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  • Huntgoddess profile image

    Huntgoddess 17 months ago

    I've been taking the bus for several years now. So I don't anticipate having to think much about this in the near future. Possibly never again?

    I was never a real strong driver. I didn't learn to drive until I was 49. Not sure I even miss it?lol

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  • Doug Cutler profile image

    Doug Cutler 20 months ago

    I believe you got that backwards. The charging battery is the one that is putting out the hydrogen. I blew the top off one testing a starter on top of the battery while the engine was running. Also you will see the hydrogen bubbles while charging

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vperry says

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6 years ago
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