CTEK also has good products - I have several of the MUS 4.3 units. The German car manufacturers rebadge them with their own logos & offer them at the dealerships. Check pricing on eBay & Amazon.
https://smartercharger.com/collections/vehicle/?i=1
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2015 BMW 228i in EstorilBlau II Metallic / Terra Dakota Leather - 6-speed manual, M Sport Package, Cold Weather Package, Lighting Package, Premium Package, Harman Kardon premium sound, Anti-theft alarm system, Blue Metallic Matt Accent Moldings, Aluminum Hexagon Interior Strips, Anthracite Headlining