I have a car that has a dead battery and i want to jump start the dead battery. But i don't know how long it'll last. So i want to find out.|||A long time.. you could have a bad alternator do you have subs or did you leave your car radio on with the car off for a long period of time? you can always get your battery tested at pep boys or something|||It depends on WHY your original battery "went flat"....if you left the light on by accident and ran it down, for instance, so long as you drive a fair distance after your "jump". you should be fine forevermore....
If it went flat because it's a dying battery, then it'll die straight away...
Or if it went flat because your alternator is not charging properly, it will also be flat again REAL soon...
These are all easy things for someone with a voltmeter to check....make friends with someone who owns a voltmeter!
Good luck...|||unless the car battery in you car is completely shot it should be fine. when you engine is turned on the car will automatically charge the battery.
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