Battery Drain - Reliability Guide & Repair Costs
Understanding Battery Drain
Complex luxury cars with 'Hot-Vee' engines run cooling fans for minutes after shutdown to protect the turbos. This aggressive cooling, combined with many control modules, kills batteries rapidly.
Symptoms
- High Battery Discharge warning
- Car won't sleep (comfort access disabled)
- Dead battery in morning
At A Glance
- Repair Cost:
- $400 - $600
- Prevention:
- Register new batteries immediately. Use a trickle charger if not driven daily.
Affected Vehicles & Guides
The following detailed guides cover Battery Drain specifically for the listed models.
BMW 650i Reliability: The Beautiful Money Pit
The breakdown of the BMW 650i (F12/F13/F06) Gran Coupe reliability. Common failures with the N63 V8, Convertible Top hydraulics, and frameless windows.
Reliability: 43
/100
Read Guide →
BMW 750i Reliability: The Most Expensive Luxury Sedan to Maintain?
A survival guide for the BMW 750i (F01/G11) with the N63 V8. Detailed costs for Valve Stem Seals, Air Suspension, and Injectors.
Reliability: 38
/100
Read Guide →
BMW N63 Engine Reliability: The Definitive Guide (4.4L V8 Twin-Turbo)
The internet's comprehensive guide to the BMW N63 V8. Detailed analysis of Valve Stem Seals, Timing Chains, Oil Consumption, and the 'Hot-Vee' design flaw.
Reliability: 42
/100
Read Guide →
Disclaimer: Repair costs are estimates based on independent
specialist rates. Dealer prices will significantly exceed these figures.