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      02-17-2020, 03:22 PM   #18
Billfitz
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Drives: '15 328iX GT
Join Date: Jan 2015
Location: New Hampshire

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My battery is five years old and is nearly as fresh as new. Putting it on a maintainer every night when the temperature gets to 25F or lower is the reason why. The only way I see the OPs battery being toast at only 3.5 years is if his driving is almost all short trips. That causes maximum stress with minimal charging per start up.