Plenty of DIYs done for this so not meant to be one. Here are some pics of the old one, new one, and some tips.

Old battery seems to be the original BMW battery. Bought the 2004 X Oct 2008 - is now Dec 2010. Sorry for the crappy cell pics.

Original battery (white) next to new battery (black)


Original battery made in the USA


Original battery specs - 90AH & 720 CCA


New battery is World Source One and made in the USA - 100AH & 900 CCA. Cost $137 including tax. Pro-rated warranty which I can't remember but I think was either 48 months or 60 months. Was trying to use an Interstate MTP-93 but the shop couldn't get it today and I couldn't wait.


Found a piece of black rubber/plastic at the bottom near the battery hold down. It has a reinforcing metal in it (look at the end). I don't know where it came from. I put it back on the bottom of the battery hold down clamp.


Found the lock clip loose under the battery hold down. I tried to put the battery hold down and align it with the clip just sitting in the battery well. After several frustrating tries, figured out that its supposed to hold the battery hold down clamp like in the pic. DOH!


New battery installed. This battery came vented on both sides so I used the supplied plug on the other end and just connected the old vent tube. Pic of the original battery installed (white).


You only need a 13mm socket to loosen 2 bolts and 2 nuts for the brace above the battery (mine also holds the air compressor). The nuts on the battery cable and the head on the battery clamp down uses 10mm.

Afterwards, clear the yellow triangle 4x4 light by turning the steering wheel completely left then all the way right.

Oh .. some pics with the new X6M wheels and Vreds.