Replaced the original Varta battery that had been in my 2013 128i for over eight-years! I just started to get some "low voltage" warnings and the Comfort Access wouldn't work until I woke it up with the key buttons. Charging it maybe once every week-and-a-half would keep the warnings away but I broke down and replaced it with the BMW replacement which is a bit larger. I figured the Varta deserved a nice retirement!
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