DISCHARGED BATTERIES - VEHICLES IN STORAGE/LIMITED USAGE
Publication Date: March 5, 2007
2005-2008 Mustang 2005 Explorer Sport Trac 2005-2008 Expedition, Explorer 2007-2008 Explorer Sport Trac
Some 2005-2008 Mustang , Explorer 4dr, Mountaineer, Expedition, Navigator, 2005 Explorer Sport Trac and 2007-2008 Explorer Sport Trac vehicles may experience a no start and have a discharged battery. They are usually stored for prolonged periods of time or are driven infrequently for short distances. Batteries will discharge while the vehicle is in storage due to normal current draw loads. Over a period of time, 30 days or more, vehicles in storage will have shallow to deeply discharged batteries as a result of lack of use or normal current draw.
Follow the Service Tips steps to correct the condition.
Charging system diagnostics and battery draw test are located in Workshop Manual, Section 414-00.
Discharged batteries need to be properly recharged following the procedures in TSB 07-5-8.
All modern automobiles have several micro processors in their electrical system that will draw small amounts of electrical current when the vehicle key is off. Normal current draw is between 20-30 milliamps (workshop manual specification is up to 50 milliamps 0.050 amps).
The more discharged a battery becomes, the more susceptible it is to permanent damage. This is more likely in low temperatures (below 32 °F (0 °C).
Batteries will discharge while the vehicle is in storage due to normal current draw loads. Over a period of time (30 days or more), vehicles in storage will have shallow to deeply discharged batteries as a result of lack of use or normal current draw.
ELECTRICAL OR ELECTRONIC ACCESSORIES OR COMPONENTS ADDED TO THE VEHICLE BY THE DEALER OR BY THE OWNER WILL INCREASE THE CURRENT DRAW LOADS AND ADVERSELY AFFECT BATTERY PERFORMANCE AND DURABILITY.
The vehicle's charging system is designed to supply the vehicle's electrical power needs and maintain the battery to near full charge during normal vehicle use. The charging system is not capable of bringing a deeply discharged battery back to near full charge in a short amount of time such as allowing the vehicle to idle for 15 minutes to "recharge the battery" or from short drive cycles.
Short drive cycles will only provide a small surface charge to the battery. To fully recharge a battery that is fully discharged requires operating the vehicle for approximately two (2) hours with engine speed above 1500 RPM.
Vehicles that are stored for extended periods or are driven infrequently for short distances may need to use an auxiliary battery maintainer/charger that is expressly designed to maintain the battery state of charge during storage. These maintainers/chargers are available in the automotive aftermarket and should be used according to their manufacturer's direction.