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Lithium-Ion Batteries Have Gone Too Far
(www.theatlantic.com)
This is a most excellent place for technology news and articles.
Recycle your old batteries https://www.consumerreports.org/home-garden/recycling/yes-you-need-to-recycle-your-old-batteries-a5385943645/
From what I've heard, the real primary reason is fire risk. This is obviously not 100% true, but landfills should be isolated from the surrounding environment especially when it comes to fluids/etc that could leak into groundwater. There are a lot of processes they should already be following to keep that from happening.