Thank you all for the advice. I have (physically) placed the battery with the one that the owner got from local AutoZone store - the store clerk would normally replace batteries on other vehicle models at the store but not for BMW's.

Attached are photos of the new battery and the original BMW unit. The owner said that they never replaced the battery after purchasing the X5 new. There is no time stamp on the battery to indicate when the battery is produced - I guess the dealer shop can check it out with the bar code on the battery.

(I went though the attachment process for 4 photos in JPG format and each file is smaller than 900KB, the photo attachments don't show up with this note. What did I miss?)

I am impressed by BMW's engineering to the details - my experience with US and Toyota (all before 2006) cars are that a battery would last about 5 years at best, half time of this BMW battery. The IBS must doing something great! I still own a 1987 MB 420SEL. Although I drive it less than 1k miles each year for the 10 years, a replacement battery would last about 5 years.

I am on purchasing the Carly app. Some Carly customers' feedback (November 2017) stating they could not do coding and others say they got error codes often - of cause we don't hear good experiences much online. My Andriod phone is an old Samsung Galaxy with 32GB storage and I also have an Apply iPad with 16GB. I intend to purchase a Pro version but the Carly link in this thread would lead lead me to a Carly Lite version for iOS (for my iPad). Your advice on choosing Andriod or iOS versions of Carly Pro are very much appreciated.

Attached Images