I have a mini 1.6 cooper 57 R56 model, The battery keeps draining, I have checked the alternator and is putting out 13.5v, when I take the battery off the car it was putting out 11.4v on the car it went down to 4.4v. I have a had a "Black Box" fitted for my daughter, could this be draining the battery?
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MINI Cooper Battery Replacement and Battery Tender Installation (R50/R52/R53 2001-2006) | Pelican Parts DIY Maintenance Article