The Battery: Notes

2009 BMW X3 StandardSECTION Notes

Model: All 

Production Date: All 

Fig 1: View Of Electrical Components Connected To Battery
G03390172Courtesy of BMW OF NORTH AMERICA, INC.

Purpose of the Automotive Battery: 

The battery is the primary EMF source in the automobile. In addition the battery performs the following functions:

  • Provides voltage and current for the starter motor.
  • Provides voltage and current for the ignition during cranking.
  • Supplies all electrical power when the charging system is not operating.
  • Supplies the extra power necessary when the vehicle's electrical load exceeds the supply from the charging system.
  • Acts as a voltage stabilizer in the electrical system. The battery evens out voltage spikes and prevents them from damaging other components in the electrical system.
  • Provides power to KL30, KL15 and KLR.

The battery does not store electrical energy. It stores chemical energy that is converted to electrical energy as it discharges.

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.