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Sounds like a flat / failing battery.
Put a good quality battery charger / analyzer on it a Ctek or a Victron Blue and leave it for as many hours as it needs 10 to 16 hours.
A car alternator isn't designed to charge a battery from flat.
A battery that has repeatedly gone completely flat wont be in the best of conditions so consider replacing it.
Last edited by capese21; 01-16-2024 at 09:56 AM..
Reason: grammer
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