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That's weird, it's very common to replace ev batteries as they age because they tend to lose capacity depending on how they're used.
Maybe if you've only used gasoline vehicles up until this point you would not have heard about replacing batteries? Although gasoline car still have batteries which have to be replaced often. EVs just have much bigger batteries than the car batteries you're used to, if that makes it more relatable.
Delfast recommends ten years max, Nissan recommends 8, most ev batteries lose a significant portion or more(easily 30% ) of capacity before a decade is up, just google any ev company for their company's recommendation and then weigh that against real world usage and replacement statistics.
Interesting. I guess my 2011 Nissan Leaf would be an outlier then. It's lost some range, but I think it will keep working for me for at least another 10 years.
That sounds standard. EV batteries can reliably work for 15-20 years depending on how much and how aggressively you drive, how well the batteries were built, how the batteries are recharged, but the effective capacity goes down every year as a matter of the nature of rapidly discharged,/recharged batteries as they're currently built.
Battery tech is improving rapidly, but we're nowhere near 100% storage/discharge/recharge efficiency yet that would be more gentle on the chemical and physical makeup of the battery.
Tesla claims their batteries last the life of the car, but they define the life of the car as 160k miles OR 8 years of warranty on their batteries, whichever comes first because batteries just don't last as long as we'd like them to yet.