Replacing and registering new battery...

Hello Everyone!

Lately I've been having problems with my 2003 BMW 745Li. All kinds of warnings popping up from, "Parking Brake Malfunction" to. "Fluid Loss In Steering or Hydraulic System" to, "Vehicle Detects Increased Body Roll in Curves" and then the latest was, "No Transmission Display. Poss. Reduction of Gear Selection, etc."

Anyways, I'm hoping all this will be fixed after replacing my battery. Last time I replaced the battery was over 6 years ago under warranty. So my question is since reading all the new battery and registering post, where can I download the software to register the battery, and what cables do I need to buy and where? I heard on ebay is where I can buy the cable, but if I can get the item number to the exact cable on ebay, would be greatly appreciated. Thanks in advance to all that can help me out.


John