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Old 09-12-2020, 09:41 AM   #4
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Join Date: Jun 2018
Location: Minneapolis Minnesota
Posts: 319
Default Re: Optima battery will only chug to 50%

Use a manual charger at 2 amps to get it up 6.5 volts. Then discharge down to 6.2 volts using headlights and then charge it back to 6.3-6.4v
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