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From the article

> Replacement batteries for any model will have to remain available to users for at least five years after the last unit of the product is placed on the market, the regulation also states.

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Using a 5 year old phone is common these days. I still see plenty of home button iPhones in the wild.
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While standardization would be nice, I can still order batteries for the Samsung phones I've used 15 years ago. Availability might not be that much of an issue with larger brands.
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As long as those unused batteries you can find are fresh a 15 year old unused battery would be doa
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There's an aftermarket for phone batteries. They're new batteries produced by what I imagine are unaffiliated manufacturers. As long as the phone is popular enough, there should be enough market for manufacturers to make new batteries.
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