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Sony's WF-1000XM4 earbuds
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===Reported battery failures and overheating incidents=== At least four documented cases involve earbuds physically swelling or splitting open with audible βpopβ and chemical odor while charging in the case.<ref>{{Cite web |date=21 Feb 2023 |title=Sony WF-1000XM4 explodes while charging |url=https://thewalkmanblog.blogspot.com/2023/02/sony-wf-1000xm4-explodes-while-charging.html |access-date=3 Aug 2025 |website=thewalkmanblog.blogspot.com}}</ref> One user reported an earbud splitting while being removed from the ear during a meeting. Additional cases were documented via community forums in mid-2023.<ref>{{Cite web |date=12 Jul 2023 |title=Two More Sony WF-1000XM4 Battery Failures |url=https://thewalkmanblog.blogspot.com/2023/07/two-more-sony-wf-1000xm4-battery-failures.html |access-date=3 Aug 2025 |website=thewalkmanblog.blogspot.com}}</ref>
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