Quote:
Originally Posted by evertonfc
Do you have any idea why the MIL won't go out or the battery has never held a charge longer than three days since it was installed?
The battery warning light has never come on and after posting i replaced the window carrier (20 minutes with a little bit of minuscule raising and lowering of the window) and again the battery was so flat I had to use another car to jump start it.
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The "battery" warning light doesn't indicate anything to do with the battery (other than it's no longer being charged) - it actually indicates that the alternator/regulator output has fallen to below the voltage output of the battery. This usually indicates a total failure of the charging system.
But you say you don't have that, so assuming the battery is being charged properly is possible you have what is called a "parasitic drain" - something is pulling large amounts of power from the battery even when the car is off. This is not unknown on the e53 and can be caused by the A/C fan speed control resistor unit, the stereo and a few other common items. It can be tracked down by isolating the various circuit by pulling key fuses while monitoring the drain on the battery.
Coming back to the battery charge for a moment, it's worth pointing out that it would take a pretty powerful charger at least 8 hours or more to fully charge from flat a large battery like the one in the e53. A quick drive around the block after jump starting it isn't going to do it. I wouldn't be worried by the battery condition unless its failing quickly after a good long full charge (on an external charger).
Or a 500 mile drive....
