How do i shut the power off it is draining my battery

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The problem is that an electrical component in the BMW that should be dormant when the vehicle is shut down is actively drawing power.
The only way to track it down is to have tests run to see which circuit is drawing excessive power because there are numerous components that might be the cause.

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Solving Automotive Electrical Problems

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modernradios draw so little power that the battery will not drain over night
there is a bigger problem in a power control module that supplies power to the radio that is draining the battery
key out = battery off and if the battery is still on you will have to get an accredited auto ekectrician familiar with your car to find that control module or relay fault

Sounds like a slow drain - like a dome light or short in the wiring.
If the battery stays charged when it is disconnected, you'll have to check for a power drain in the car.

excessive power loss due to alternator bad..take to parts store so they can check it..diode trio is bad letting power back thru the alternator..basically it wont shut off now and will kill the battery after several hours..

I suspect parasitic draw. All vehicles draw some power from the batteries when the car is shut off. Certain accessories such as clocks, radios remote door openers and alarms always need power. The normal power used is called parasitic draw.

It is always a very low draw so it doesn't run the battery down. If you install accessories like shortwave radios or plug things like inverters and portable refrigerators into the accessory socket and operate them too long without the engine running you can drain your batteries to the point where the engine won't start. If there is an electrical short in the vehicle or a malfunctioning accessory it could be drawing much more than its normal load causing a drain on the batteries. If you leave your door open and the inside lights stay on all night you could drain the battery down till the car won't start.

Here's also a good resource for your car specifically on narrowing down the cause of the drain.

You do not say what brand and model vehicle you have.

The rear window demisters drain a lot of power and are usually programmed to switch off automatically after about 15 or 20 minutes of use. They should also cut out fully when the vehicle's ignition is turned off and of course when you manually switch them off.

1. When you are driving and running a host of electrical units simultaneously in winter there is maximum power drainage and any shortfall in power from the alternator has to be drawn from the battery. This will be a problem if you have a weak battery that is not holding it's charge well or if the battery is not fully charged once it has been nearly or fully drained. It will also be a problem if the alternator is not producing it's optimum power while the vehicle is running.

Batteries do not respond well to being drained frequently and when they are they should always be fully charged again each time with a battery charger at the earliest opportunity. (Running them down and then expecting the vehicle's alternator to do all the battery recharging is not a sound practice).

2. It is possible the rear demister is not shutting down automatically after a period of operation as it is likely to be programmed to do in your vehicle. This is easily checked. If it is not shutting down, and the battery is needed to supplement the vehicles power supply when driving, then the battery can be run down in time.

3. If the rear demister is left active but not shutting down when your ignition is turned off your battery will quickly drain.
You should check that power to the rear demister is off once the ignition is switched off (and when you switch the demister off manually). This is unlikely to be a problem but in the unlikely event that you find it is still operating then you can pull the fuse dedicated to the rear demister.

I hope this helps.

Do the fans run properly and shut off when cars is off? If not they may be draining the battery. A bad stock antenna could drain battery because of the control module. Also the central locking pump if it keeps running (its supposed to shut off after 30 seconds) but if it fails it will drain the battery.

Disconnect each system 1 by 1 or pull fuses 1 by 1 to find out. I would believe its your neutral safety switch tho. Its on the transmission.

the sliding door is probablly draining the battery,, have door checked.. make sure tracks are clean and hinges are not binding

you will need to do a test with a battery light disconnect the negative wire on the battery and connect one end of the test light to the battery and the other to the terminal with everything switched off if the test light is lit you have a draw if it is not lit then it is something else sometimes door switches and glove box switches wear out and need added lift to properly shut the open circuit down