Battery Heater Blanket: Operation
WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
The temperature of the battery can affect battery performance. Only DAIMLERCHRYSLER approved battery blanket/block heater combination should be used. The battery blanket heater is designed to provide optimum charging system performance in very cold ambient temperatures below -17.8°C (0°F).