Night driving during winter months can overload a heavy-duty truck’s batteries and electric system. The reserve capacity rating (RCR) is important if long-term parking with electrical loads is required. A battery at 80°F (27°C) has 100 percent of its power. That same battery at 14°F (210°C) loses 50 percent of its available power. As battery available power is reduced with low temperature, the mechanical effort required to turn the engine over increases. An engine at 220°F (229°C) is over three times as difficult to crank as an engine at 80°F (27°C).
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