The battery in my Merc failed last year after the car was standing outside under a layer of snow in sub zero temperatures for 2 weeks whilst I was away on business. It was date stamped 2000 so 8 years old. As someone mentions above, it didn't fade away, it literally wouldn't turn the engine over from one day to the next. It died so suddenly that I initially suspected a blown diode pack in the alternator.
Fortunately Mercedes were offering OEM replacements at 40% off list price so I jump started the car, drove to the dealer and bought a new 100Ah jobby which I fitted it in the car park. Had difficulty hauling the old one out though - I'd forgotten how heavy lead acid batteries are.
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Ford Focus - Battery life new
Ford Focus - Battery life new