The OEM battery in my June 2007 build date Z4 M Coupe is still going strong. I keep it on a Battery Tender when the car will be sitting idle for more than a week. A recent load test shows the battery is in good condition.
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Jim Millet
2023 Hyundai IONIQ 6 SEL AWD Ultimate Red
SOLD: 2007 BMW Z4 M Coupe Imola Red
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