Overview of possible causes

A breakdown due to a drained battery or a problem in the vehicle energy system is not necessarily the result of a faulty battery. The various causes for discharge of the battery can be placed in two main categories:

• Vehicle faults:
  • Vehicle does not assume sleep mode.
  • The vehicle keeps being woken up.
  • Standby current too high in rest state.
  • Faulty alternator (poor charge balance)
  • Faulty battery.
• Unfavorable customer behavior:
  • Side lights, parking light or hazard warning flashers were switched on for too long.
  • Terminal R or Terminal 15 switched on for too long
  • Long immobilization period.
  • Unfavorable driving profile (short-distance driving).
  • Frequent use of auxiliary consumers or use of auxiliary consumers for a longer period (increased power consumption at a standstill).