Check the current draw when the car is switched off. if it is not obvious whet is staying on, remove fuses one buy one and see when the current draw goes down. Note that the car does not go to "sleep" until something like 16 minutes after you turn off the engine.
SOURCE: battery drains in my 1984 BMW 318i
I have the same car I had the same problem.If you have the correct battery for your car with the same problem you have a short or positive ground in your dash/electric fuel pump/fuse box also be carefull of how you take the key from the ignition and if they're old replace them.
SOURCE: Battery on BMW 740i keeps dieing
you need to disconnect one side of the battery, put one lead from an ampmeter on the battery post you have disconnected and the other ampmeter lead on the cable you took off the battery. with nothing turned on on the car , all doors closed the reading on the ampmeter should be no higher than 0.17 amp, if it reads a lot hgher go to the fusebox and remove one by one all the permanent supply fuses looking at the reading every time until you find the circuit that is causing the high reading, this will be the drain. alot of the time it can be central locking system playing up, boot light, glove box light not switching off, stereo wired wrong. hope this helps.
SOURCE: 1999 bmw 528i replaced battery and alternator
Replace your battery when its being tested there not testing it under a heavy enough load. A battery could have a dead cell in it and still show good on the charger. I've had that problem a few times.
SOURCE: bmw 2000 7 series trans. failsafe prog.
pretty quick. but be sure it the alternator. You can test it by starting the car then unplugging the battery. If it cuts off when you unplug it it's the alternator if it keeps running it's not the problem
SOURCE: 1998 bmw 528i battery died. How can I unlock the
coathanger job ,or put some jumper leads one to the chassis and the positive to the starter motor terminal feed ,something clicks here ??but my memory has faded a bit ,iam sure that somewhere on the rear of the vehicle is a connection for a power supply to work the locks to open the vehicle or evan charge the battery .Cant recall properly but i think i pulled a cover off a light or something then put a 12v supply to open the vehicle
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