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Sony's WF-1000XM4 earbuds
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===Underlying causes=== Community posts & technical speculation point to a combination of: *Firmware 1.4.2 disrupting charging controls and thermal management. *Possible use of ZeniPower (Z55H) cells in early production batches (mid-2021 to mid-2022) being more susceptible to overheating.<ref>{{Cite web |date=Jun 2022 |title=WF-1000XM4 Sudden Battery Drain Issue {{!}} 2 days after warranty period ends! |url=https://community.sonylatvija.com/t5/portable-audio/wf-1000xm4-sudden-battery-drain-issue-2-days-after-warranty/td-p/3873533 |access-date=3 Aug 2025 |website=community.sonylatvija.com}}</ref> Firmware v1.5 and v1.6.1 were released to mitigate the issue, but Sony stated only that these updates βreduceβ battery loss rather than repair existing damage.<ref>{{Cite web |date=6 Dec 2022 |title=Sony WF-1000XM4: Latest firmware update may worsen battery life for some earbuds |url=https://www.notebookchat.com/index.php?topic=159996.0 |access-date=3 Aug 2025 |website=notebookchat.com}}</ref>
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