I'm reading that a good fully charged battery should be at 12.3 V resting. My battery has been sitting on a smart charger and maintainer and says 12V only and the charger
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Understanding what "BATTERY 100%" really means - 100% yet still shut down low voltage - Victron Community
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How to check the battery level of a 12v car battery (like how smartphones show the battery level) - Quora
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