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The reason we don’t see exploding battery attacks more often is not because it’s technically hard, it’s because the erosion of public trust in everyday things isn’t worth it.
(www.bunniestudios.com)
edit: after 20 comments, i'm adding a post description here, since most of the commenters so far appear not to be reading the article:
This is about how surprisingly cheap it is (eg $15,000) to buy a complete production line to be able to manufacture batteries with a layer of nearly-undetectable explosives inside of them, which can be triggered by off-the-shelf devices with only their firmware modified.
Sending out IEDs that will probably explode in a supermarket and kill civilians is generally considered a war crime. So far 2 kids killed in Beirut by the Israeli bombs in devices.
Exterminating the next generation of people who would live on the land they want to steal is the goal.