40 Operator’s Manual Vehicle Maintenance CXU, CHU, GU, TD, MRU and LEU Be sure that the batteries used in a particular vehicle are rated for the specified Cold Cranking Amperes (CCAs) necessary to ensure reliable cold weather starts. This is important, since even well-maintained batteries chilled to 18 °C (0 °F) may temporarily be capable of providing only 40% of their rated capacity at 27 °C (80 °F). Keep the terminals clean to prevent formation of power-robbing corrosion. In winter, to avoid freezing the electrolyte, the battery must be fully charged. A fully discharged battery will freeze solid at 5 °C (23 °F) and possibly sustain permanent damage.
Before the onset of cold weather, be sure to protect this vital component by monitoring its condition as well as inspecting the charging and starting systems.