About four in five used car dealers in China now refuse to accept electric vehicles older than five years, citing uncertainty over battery health and the high cost of replacement, according to the International Energy Agency's Global EV Outlook. China, the world's largest EV market for a decade with 44 million electric vehicles on its roads, is the first country where EVs are aging at scale — and dealers there have no agreed method to assess battery condition, meaning resale prices are falling sharply, with a three-year-old EV now fetching around 45% of its original price. As Chinese automakers exported more than 2.5 million EVs last year to markets including Europe, Southeast Asia, and the Gulf, industry experts warn that importing countries will face the same valuation problem once those vehicles reach the five-year mark, where battery warranties begin to expire and resale interest drops significantly.