Remove the battery and take it to most any auto parts store and have them test/charge it. If it is good, you are back on the road again in an hour. If it is bad, then take it to the dealer, but the kicker is, it may have to be in the car and towed back to the dealer. I tried taking just the battery back for warranty to a GM dealer and was told that I needed to have my vehicle towed in, so they could check the charging system to find what was at fault. Just the clock and preset memory will kill a battery cell in time. Especially when the summer heat comes into play too.
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BMW Z4
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