My original factory battery lasted over eight years. I replaced it with an Odyssey. It recently spent almost seven months connected to an Odyssey OBC-20A. No issues when I started it up last week. Prior to that, it had been on a BatteryMINDer 12116 for six months last year. No issues last year. Been using either one - mostly the OBC-20A - whenever it's in my garage.

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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