I think the real concern is the "impulse charge" feature contained in most battery chargers...you know, the ability to "jump start" a car by hitting that switch that makes your cockpit courtesy lights illuminate like stadium mercury floods!

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car