I've been using BatteryMINDers for over ten years. I recently hardwired a

https://www.batteryminders.com/2012a...acid-batteries

in my Ram 2500 diesel. Before that, used a couple of the older "wall brick" models. I still use those ones actually to maintain an eight-year old Interstate MTP flooded-cell battery and a 10-year old Optima Red Top battery.

When I replaced the original eight-year old battery in my 2011 X5d which had been tended by a BatteryMINDer since my ownership in late 2014, I replaced it with an Odyssey PC1350 battery and purchased their OBC-20A charger/maintainer. My X5 is garage-kept so the Odyssey unit made sense to use.

So, there are some of my recommendations.

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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