if you have a battery charger with start assist you can try to cook the battery a little and bring it back to life so long as there is enough electolyte in it i usually like to do 250 amps on 10 seconds off ten seconds a few times then 40 amps for 20-40 minutes and then a 10 amp charge for a couple hours and finish it with a 2 amp overnight. the high amps work to cook the oxidation off the plates, just watch it to make sure it doesn't start boiling or it could explode. If the electrolyte is low then your screwed.
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