I don't know. My original battery lasted over seven years. I guess the BMW batteries were pretty good in 2011. Probably won't go wrong with a BMW battery. Duracell, Odyssey, I still like Interstate (their top line), NAPA Legend are good. Most of the WalMart EverStart are decent.

Come to think of it, because I was on my original battery, maybe Carly didn't show the last registered battery. Maybe that's not what it was showing me.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim