Finally, I found a local garage next to my house (next street over) who sold Interstate battery. The owner ordered one for my MTP-H9 for $197.95 + tax. It was the exactly same spec. as BMW battery - 850 CCA, 1100Ah. I replaced the battery and 2 days later, the voltage of the battery still hold at 12.1V. I had not driven the car yet since the battery installation. I will drive it tomorrow.

Do I still need to register the new battery even it is the exactly same spec. as BMW battery ?

Thanks,

 

My car is at the stealership as we speak. They recently serviced my shifter since my tranny wasn't going into sport mode, and the same day I picked it up was when the car stopped cranking. I left the car with them so that they can check for drainage issues, and let me know if it's the bettery or not.

If it is the battery, Pep Boys said they have one, as well as the memory module or $109 & $7 respectively. The stealership wants $475. Guess which one I'm going to go with!

 

I just replaced my battery with a BMW AGM battery, replaced the IBS, took the car to the dealer and had them do a complete code to retrofit the new AGM battery into the computer. No more error messages!!!! Sucked having to spend all that money, but these cars go through a battery in months if its not registered or if the IBS is bad. Oh and there is no way to test a bad IBS sensor so you just have to buy one and install it.