Recently charged car battery won't start

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jarjarbinks asked Jun 2, '22

Recently charged car battery won't start

Hey All,

Recently purchased a Victron 12v 15A battery charger.

Charged my century battery of 2 years as the car was not used in over 2 months and it charged completely (used recondition option) over 24 hours. Charged 66 AH?

It has been less than a week and the car won't crank, have only started it here and there as I don't currently drive.

Is it possible that the battery is just dead? or could there be something else draining the battery when not in use?

I thought when the battery passes the device test and holds a charge it would work normally or at least hold a car for longer than a few days.

Was able to jumpstart the Car using a Gooloo GP4000.

Car is a Mazda 6 2009.

Would appreciate any comments.

battery charging AGM Battery

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Answer 1 · 2022-06-02T15:52:50Z

kevgermany answered · Jun 02, 2022 at 03:52 PM

If the battery is faulty, it will appear to charge, but will show a quick voltage drop. And it won't maintain much voltage when you try to start. Off charge, what is the battery voltage? And how long since it was charged?

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jarjarbinks commented · Jun 03, 2022 at 06:04 AM

Don't have s multimeter to check the off charge voltage. Been 5 days since full charge. I wondered if it could be parasitic draw, but that also requires further testing. Or maybe the battery is just dead since it was not used for 2 months.

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kevgermany ♦♦ jarjarbinks commented · Jun 03, 2022 at 07:04 AM

Multimeter is a lot cheaper than a new battery. But I wouldn't keep on with the recondition charges. I'd be tempted to get the battery tested at a battery centre.

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jarjarbinks kevgermany ♦♦ commented · Jun 03, 2022 at 09:10 AM

Fair enough, thank you for your help, would any cheap multimeter work for the testing?

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kevgermany ♦♦ jarjarbinks commented · Jun 03, 2022 at 07:38 PM

Yes, no need to spend a fortune. If you want more versatility, go a little higher and get one with a clamp for current measurements. You'd be surprised how often you use them. Should be able to get a decent one under 30 bucks.

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