Ask a Car Mechanic and Get Answers to Your Car Questions ASAP
e550 why does my battery die for no apparent reason? What is draining the battery even though the engine is off and no lights are on?
Hi there - the big question is how long does it take the battery to die?
Most batteries will self-discharge (just sitting) within about 3 months.
Even though your car is sitting with the engine off, and all the lights off, there is a small amount of current flowing to the on board computers, navigation system, alarm system, etc. This is called parasitic draw, and typically the higher-end the car, the greater the parasitic draw.
How long does it take for the battery to go dead?