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Even a strong fully charged battery wont feel 100 if the temperatures drop enough. In fact at 32F a cars battery loses about 35 of its strength. Your battery naturally recharges as you drivebut you must first face the challenge of getting it started.
Why does the cold drain battery power.
According to Interstate Battery a weak battery will start to freeze 503 at 32 degrees Fahrenheit while a fully charged battery wont freeze. If you use your phone or camera in really cold weather its battery life drops too. Certain devices such as clocks and alarm systems continue to drain battery power when the vehicle is off. So ideally youd store batteries in cool.
