06-19-2013, 10:26 AM
Join Date: Sep 2008
Location: Central Florida
Total Cats: 176
Mysterious (multiple) battery drain?
Is this a thing?
My BMW has been giving me an error message which I find is relatively common based on message board search results. That error is "increased battery discharge." For the most part, it does not affect the driveability of the car, but it does prevent the smart key operation of unlocking the doors by touching the handle. I can still start the car with the key in my pocket.
That's not really the main subject of my question.
While this has been happening, I've also noticed:
- The batteries for my cordless power tools (two Craftsman C3 units) barely hold a charge. Once taken off their chargers and put in the tool, they only last for a couple of seconds.
- The LED indicator on my trickle charger for my Miata flashes rapidly rather than staying on solid. The car started today; I moved it a few feet, and then shut it off. I left it off the charger for about 30 minutes, came back out and it wouldn't start. Lights come on in the dash, but it won't turn over.
It's almost like the M3 is doing something that is draining all of the batteries in the garage (or preventing them from charging fully). Is that a thing?
I'm trying to figure out how two different battery chargers, plugged in to two separate outlets, and a car (not plugged in to anything at all) are all having their batteries slowly drained.
I will bring the power tool charger and battery in to the house and see if the battery will store and hold a full charge.