How long after a jump until the battery's charged?
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Joined: Apr 2013
Posts: 25
How long after a jump until the battery's charged?
Jumped my car on a dead battery yesterday, and it was running for close to 20 minutes, at least.
I tried to start it again later on and it wouldnt turn over.
How long would a car need to run before the alternator charges that battery back up to a reliable charge?
I tried to start it again later on and it wouldnt turn over.
How long would a car need to run before the alternator charges that battery back up to a reliable charge?
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Joined: Jan 2008
Posts: 4,943
From: Mountains of Utah
Good you got your Monte started. Guess the answer to your question really depends on the age of your battery. If the battery is relatively old it may never hold a charge again. You really need to determine why the battery lost it's charge. Auto-Zone and such can test your alternator while it is still in your car. Should it test good, then your battery may be bad. Nothing worse than buying a new battery only to have it dead in a few days because you had a bad alternator.
If your using your alternator to fully charge your battery you could destroy your alternator. It is not really meant to charge a dead battery and you could burn out your alternators diodes as it it causing it to run at full power. It's meant to maintain your battery. If the battery has been discharged to the point were it is dead your alternator will not charge it at all. An alternator needs a small electrical current to 'excite' it into charging. It WILL NOT charge a totally dead battery. A relatively good battery can be charged by driving your car about 1 hour with your A/C and radio off.
If your battery is relatively new and you drained it down try and borrow a battery charger with a "Deep Charge" cycle option. Permit it to charge for about 3 hours and or 2 hours on a 20 to 40 amp setting. If she will hold a charge it should start your car repeatedly. If the battery will start your car after charging only to die again a few days later and your alternator did check out to be fully operational then your battery is really bad and your going to be in a market for a new one. Best of luck... Been there done this not so very long ago. Extreme heat and extreme cold can really kill a battery.
If your using your alternator to fully charge your battery you could destroy your alternator. It is not really meant to charge a dead battery and you could burn out your alternators diodes as it it causing it to run at full power. It's meant to maintain your battery. If the battery has been discharged to the point were it is dead your alternator will not charge it at all. An alternator needs a small electrical current to 'excite' it into charging. It WILL NOT charge a totally dead battery. A relatively good battery can be charged by driving your car about 1 hour with your A/C and radio off.
If your battery is relatively new and you drained it down try and borrow a battery charger with a "Deep Charge" cycle option. Permit it to charge for about 3 hours and or 2 hours on a 20 to 40 amp setting. If she will hold a charge it should start your car repeatedly. If the battery will start your car after charging only to die again a few days later and your alternator did check out to be fully operational then your battery is really bad and your going to be in a market for a new one. Best of luck... Been there done this not so very long ago. Extreme heat and extreme cold can really kill a battery.
Last edited by ZIPPY02; Sep 1, 2013 at 05:06 PM.
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