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Lebanon’s health minister says 8 killed, 2,750 wounded by exploding pagers
(www.aljazeera.com)
This is a most excellent place for technology news and articles.
They have over-pressure vents and will vent pretty violently and catch fire, but should not explode due to pressure build up.
They still explode in some cases. Plenty of clips of li-ion not just catching fire but exploding similar to how a firework might explode.
https://youtu.be/8nz5ijXcckI