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I agree that the band aid approach of just changing a cell or two may well have to be repeated periodically. I had my battery replaced at 147000 by Green bean for $1500. They came to my house, did the job and were gone in 90 minutes. At 13 months and 24000 miles later, all is still in food order. Their warranty was 5 years with no mileage limit. It is now lifetime. There is one limitation. If you don't drive the car for a 30 day period the warranty is void. Inactivity is the killer. I learned this the hard way. The guy I bought my Prius from had let it sit for months. Otherwise from what I read on the Internet, these batteries can last almost forever.