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> | ||
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Reliable source reporting includes: | Reliable source reporting includes: | ||
*Large Reddit thread linking failures to firmware 1.4.2.<ref name=":0" /> | *Large Reddit thread linking failures to firmware 1.4.2.<ref name=":0" /> | ||
*Sony official community posts noting uneven battery drain and overheating.<ref>{{Cite web |last=@angrymango |date=11 Oct 2022 |title=Can Sony acknowledge the battery issue with WF-1000XM4 firmware vers. 1.4.2? |url=https://us.community.sony.com/s/question/0D54O00007iqVLYSA2/can-sony-acknowledge-the-battery-issue-with-wf1000xm4-firmware-vers-142?language=en_US |archive-url=https://archive. | *Sony official community posts noting uneven battery drain and overheating.<ref>{{Cite web |last=@angrymango |date=11 Oct 2022 |title=Can Sony acknowledge the battery issue with WF-1000XM4 firmware vers. 1.4.2? |url=https://us.community.sony.com/s/question/0D54O00007iqVLYSA2/can-sony-acknowledge-the-battery-issue-with-wf1000xm4-firmware-vers-142?language=en_US |archive-url=https://web.archive.org/web/20260222225050/https://us.community.sony.com/s/question/0D54O00007iqVLYSA2/can-sony-acknowledge-the-battery-issue-with-wf1000xm4-firmware-vers-142?language=en_US |archive-date=22 Feb 2026|access-date=3 Aug 2025 |website=us.community.sony.com}}</ref> | ||
*Independent blogs documenting battery swelling and explosions.<ref>{{Cite web |date=12 Mar 2023 |title=Another Sony WF-1000XM4 battery failure |url=https://thewalkmanblog.blogspot.com/2023/03/another-sony-wf-1000xm4-battery-failure.html |archive-url=https://web.archive.org/web/20230316162604/https://thewalkmanblog.blogspot.com/2023/03/another-sony-wf-1000xm4-battery-failure.html |archive-date=16 Mar 2023 |access-date=3 Aug 2025 |website=thewalkmanblog.blogspot.com}}</ref> | *Independent blogs documenting battery swelling and explosions.<ref>{{Cite web |date=12 Mar 2023 |title=Another Sony WF-1000XM4 battery failure |url=https://thewalkmanblog.blogspot.com/2023/03/another-sony-wf-1000xm4-battery-failure.html |archive-url=https://web.archive.org/web/20230316162604/https://thewalkmanblog.blogspot.com/2023/03/another-sony-wf-1000xm4-battery-failure.html |archive-date=16 Mar 2023 |access-date=3 Aug 2025 |website=thewalkmanblog.blogspot.com}}</ref> | ||
*Reviewer coverage advising warranty claims.<ref>{{Cite web |date=17 Mar 2023 |title=Sony WF 1000 XM4 – We Were Wrong! |url=https://www.dhrme.nl/sony-wf-1000-xm4-we-were-wrong/ |archive-url=https:// | *Reviewer coverage advising warranty claims.<ref>{{Cite web |date=17 Mar 2023 |title=Sony WF 1000 XM4 – We Were Wrong! |url=https://www.dhrme.nl/sony-wf-1000-xm4-we-were-wrong/ |archive-url=http://web.archive.org/web/20260204155419/https://www.dhrme.nl/sony-wf-1000-xm4-we-were-wrong/ |archive-date=4 Feb 2026|access-date=3 Aug 2025 |website=dhrme.nl}}</ref> | ||
==References== | ==References== | ||