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My car battery is running a 15.5 volts all the time yet at times has a slight struggle to start. It's been really cold lately in the teens and colder. Is my battery bad? Car was put in service in June of 2011 so it's almost 8 years old now.

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    15.5V is not possible with a normal car battery - unless that is being measured while the engine is running which then says little about the battery itself.
    – mike65535
    Commented Jan 28, 2019 at 13:48

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Any lead storage battery over five years old is suspect. In my 30 years' experience, waiting until eight years to replace the battery always leads to trouble.

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