Sony's WF-1000XM4 earbuds: Difference between revisions
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Community posts & technical speculation point to a combination of: | Community posts & technical speculation point to a combination of: | ||
*Firmware 1.4.2 disrupting charging controls and thermal management. | *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> | *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}} ([http://web.archive.org/web/20260204152409/https://community.sonylatvija.com/t5/portable-audio/wf-1000xm4-sudden-battery-drain-issue-2-days-after-warranty/td-p/3873533 Archived])</ref> | ||
Firmware v1.5 and v1.6.1 were released to mitigate the issue, but Sony stated only that these updates “reduce” 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 |archive-url=https://web.archive.org/web/20251004103415/https://www.notebookchat.com/index.php?topic=159996.0 |archive-date=4 Oct 2025 |access-date=3 Aug 2025 |website=notebookchat.com}}</ref> | Firmware v1.5 and v1.6.1 were released to mitigate the issue, but Sony stated only that these updates “reduce” 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 |archive-url=https://web.archive.org/web/20251004103415/https://www.notebookchat.com/index.php?topic=159996.0 |archive-date=4 Oct 2025 |access-date=3 Aug 2025 |website=notebookchat.com}}</ref> | ||