You're kidding right? If you lived in Death Valley California, I would agree but I believe the vast majority get more than an average of 3 years on a battery.2 years is about right for these batteries. So 2 in 3.5 years isn't that far out of the norm.
EDIT: Still on Original battery in Tiguan and Golf, if it dies I will replace with a battery from Walmart. Maybe it's because I'm older but why would anyone want to downsize to a smaller battery. If the weight of the battery is an issue, you have bigger problems.
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