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Had the key in the one position with the radio on for like 20 minutes and drained the battery, left the car alone sitting for like 4 hours, went to see if it would start and it did, I'm totally confused how that happened
 

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You don't do that, I did the same thing many years ago, battery was dead in 30 minutes
 

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Had the key in the one position with the radio on for like 20 minutes and drained the battery, left the car alone sitting for like 4 hours, went to see if it would start and it did, I'm totally confused how that happened
In temperate conditions, batteries will recharge a few amps on their own over some time after they have been stressed. I have been able to do that with alkaline, NiCd and NiMH batteries. Makes sense it could apply to lead-acid batteries as well.

But modern alternators are sensitive. Using one to recharge a dead battery will often cause failure in only a couple months.
 
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