In my T5 the battery died after 2 years. However Varta batteries improved in last years. How long your battery lasts depends from how many starts you do per day and how long your daily trips are. I do a lot of short trips and and first 2 years I never charged up battery from the battery charger, it extends the life of the battery if you use battery in such conditions I do. After the dealer replaced the first battery for free I bought CTEK battery charger and I charge the battery once a week, now after 3 years second battery cranks strong even on very cold mornings.
Generally a good battery should last 4-5 years and I saw some batteries to last 8-10 years, they were GS, Panasonic and Yuassa batteries in Jap cars.
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