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The most important thing to understand is that both cold and hot temperatures can affect a car battery. In fact, hot temperatures often cause more damage to batteries. It is extremes in temperature that cause a problem, not the temperature itself. While cold temperatures drop the capacity of your battery by as much as 50 percent, hot extremes can decrease a battery's overall lifespan.
Here in Washington our trained staff can help you by answering any battery-related questions you may have. You might also want to schedule a battery test so that you can be prepared for those extreme temperatures.