Overnight battery drain in a car is not something that should be considered normal. It is usually a sign of a charging system issue. That's why if your BMW X5 battery is losing charge overnight, take it to the dealer right away.
9. This is the most obvious
cause of overnight battery
drain in a vehicle.
10. Listed below are a few
reasons that can result in
parasitic battery drain in a
car;
• Control module
malfunction
• Defective relay
switches
• Faulty alarm system
11.
12. Another common cause of
overnight battery drain in
a car is harsh weather
conditions.