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Nest time you turn your car off for 2 days, unhook your battery.
That way there is no "draw" on it.
Now if you hook it up 2 days later and it fires up, you have a "draw".
If not, the battery is bad.
you can test a battery and it will read the proper voltage, but wont have enough in it to turn a car over.
(i know from personal experience, and autozone testing it and telling me its ok. And it not being ok.)
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