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do you have any electrical engineering or chemistry degree or experience to backup this statement? Automotive batteries operate on fairly simple chemical principals. Ions transfer between plates and electrolyte based upon immediate presence or absence of electrical stimulus. Please do not propagate theories that batteries recover by simply sitting in an inactive state unless you can back that up with some evidence or fact.
Scenarios such as this are far more likely to explain the "miracle" that you refer to than the battery simply recharging itself.