Quote:
Originally Posted by TPLSM3
I've done it that way before in my E36 M3 with clamp style tender. BMW actually offers a nice battery tender that will plug into the cigar/auxillary outlet as well that I've used before. I prefer the cigar/aux. outlet style as it's one less step of going under the hood....not to mention my wife can disconnect it if she's going to use the car.
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The cig/aux power is no longer live when the car is shut down. The battery tender with the cig/aux adapter is for is for the E46 and earlier. You will need a battery tender with clamps for the E9x and E8x cars.
If you already have a tender with the cig/aux adapter you can get this to make it into a clamp style. That is what I did as I have the cig/aux version I used with my old E36.
http://www.radioshack.com/product/in...tId=2103589&cp
With the clamps, you can attached directly to the battery or the posts under the hood. Much easier to go with the posts under the hood. That is what I do.