question

jarjarbinks avatar image
jarjarbinks asked

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.


screenshot-20220602-194613.jpg


battery chargingAGM Battery
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1 Answer
kevgermany avatar image
kevgermany answered ·

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 avatar image jarjarbinks commented ·
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 avatar image kevgermany ♦♦ jarjarbinks commented ·
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 avatar image jarjarbinks kevgermany ♦♦ commented ·
Fair enough, thank you for your help, would any cheap multimeter work for the testing?
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kevgermany avatar image kevgermany ♦♦ jarjarbinks commented ·

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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