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Actually a battery that reads 12v is more than likely weak, has a bad cell, or simply in need of replacement. Car batteries are rated by their cranking amps not really the 12v. When you start your car, this puts a "load" on the battery. This is when the battery actually does it's work. So... the "load" or starter or how about the entire car is putting a strain on the battery and the battery cannot handle it. If you jump off your car and it runs ok then it's a high probability that your battery needs to be replaced. Oh, the battery should actually read around 13 to 14.5 volts. FYI--you can actually find an old battery sitting around a junk yard or behind a barn and it would probably read 12v.

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Q: Why does your 2000 dodge stratus have to charge your battery when the battery reads 12 volts?
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