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battery is located in trunk under the bottom cover if car is completly dead you will need the key and press the trunk emblem in on the top it will tilt forward then the key can be inserted from the bottom to manually open trunk then pull up trunk floor covers and attach jumper cables or charger to battery.
note; factory batterys work the best but when they go bad they dont give you a lot of warning also if vehicle is going to sit for like a week at time or more you should by a battery maintaner there cheap between 20-30 dollars like at lowes or home depot or walmart or from the dealer like 90.00 the other ones do the samething just dont say BMW
Search the BMW forums like Pelican Parts or DTM Power or United Bimmer Community. When I read of problems with convertible trunk lids, a common suspect is a failure in the system that won't allow the trunk to open when the roof is down.
If you can open the hood, you can jump start the car at the alternator. Put the positive jumper cable on the large + wire on the alternator, and attach the negative - to any bracket or to the engine block and this will start your car, or open the trunk.