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I bought my 2007 C4S as a CPO from a dealer a year and a half ago. My battery died this weekend (had used it for about 2 weeks and didn't think to use my battery tender plus) but when I tried to replace it found this aftermarket battery charger attached to my car's battery. Dealer didn't mention this to me when I bought it at ~16,000 miles (now has ~32,000). Just for fun I tried plugging it in to a wall outlet but the red charging light didn't turn on. Having this piece of hardware there made unscrewing the secure housing/mount a bit tricky but I swapped the old for a new battery and the car