Sony's WF-1000XM4 earbuds - Revision history

Bananabot: Added archive URLs for 1 citation(s) using CRWCitationBot

2026-02-23T13:19:51Z

Added archive URLs for 1 citation(s) using CRWCitationBot

← Older revision		Revision as of 13:19, 23 February 2026
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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>

Bananabot: Re-archived 2 citation(s) from archive.today to web.archive.org using CRWCitationBot

2026-02-22T22:51:14Z

Re-archived 2 citation(s) from archive.today to web.archive.org using CRWCitationBot

← Older revision		Revision as of 22:51, 22 February 2026
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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.li/~~IqJJN~~ \|archive-date=4 Feb 2026 \|access-date=3 Aug 2025 \|website=us.community.sony.com}}</ref>		*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://~~archive~~.ph/~~vwL7P~~ \|archive-date=4 Feb 2026 \|access-date=3 Aug 2025 \|website=dhrme.nl}}</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=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==

Trinity: Added archived reference links

2026-02-04T16:00:55Z

Added archived reference links

← Older revision		Revision as of 16:00, 4 February 2026
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	==Incident==		==Incident==
	Thousands of users, following firmware version 1.4.2 (released July 2022), have reported severe and uneven battery depletion, typically affecting one earbud. Most often the right. Symptoms include rapid discharge (for example, 1–45 minutes of playtime) and unusually high temperatures when charging.<ref name=":0">{{Cite web \|title=WF-1000XM4 - Severe Battery Issues \|url=https://www.reddit.com/r/SonyHeadphones/comments/x7mx2n/wf1000xm4_severe_battery_issues/ \|access-date=3 Aug 2025 \|website=[[Reddit]]}}</ref>		Thousands of users, following firmware version 1.4.2 (released July 2022), have reported severe and uneven battery depletion, typically affecting one earbud. Most often the right. Symptoms include rapid discharge (for example, 1–45 minutes of playtime) and unusually high temperatures when charging.<ref name=":0">{{Cite web \|title=WF-1000XM4 - Severe Battery Issues \|url=https://www.reddit.com/r/SonyHeadphones/comments/x7mx2n/wf1000xm4_severe_battery_issues/ \|archive-url=https://web.archive.org/web/20251214232447/https://www.reddit.com/r/SonyHeadphones/comments/x7mx2n/wf1000xm4_severe_battery_issues/ \|archive-date=14 Dec 2025 \|access-date=3 Aug 2025 \|website=[[Reddit]]}}</ref>

	===Reported battery failures and overheating incidents===		===Reported battery failures and overheating incidents===
	At least four documented cases involve earbuds physically swelling or splitting open with audible “pop” 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>		At least four documented cases involve earbuds physically swelling or splitting open with audible “pop” 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 \|archive-url=https://web.archive.org/web/20230222013611/https://thewalkmanblog.blogspot.com/2023/02/sony-wf-1000xm4-explodes-while-charging.html \|archive-date=22 Feb 2023 \|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 \|archive-url=https://web.archive.org/web/20230722095248/https://thewalkmanblog.blogspot.com/2023/07/two-more-sony-wf-1000xm4-battery-failures.html \|archive-date=22 Jul 2023 \|access-date=3 Aug 2025 \|website=thewalkmanblog.blogspot.com}}</ref>

	===Underlying causes===		===Underlying causes===
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	*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}}</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 \|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>

	===Sony's response===		===Sony's response===
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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 \|access-date=3 Aug 2025 \|website=us.community.sony.com}}</ref>		*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.li/IqJJN \|archive-date=4 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 \|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/ \|access-date=3 Aug 2025 \|website=dhrme.nl}}</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://archive.ph/vwL7P \|archive-date=4 Feb 2026 \|access-date=3 Aug 2025 \|website=dhrme.nl}}</ref>

	==References==		==References==

Emanuele: added brief summary and fixed references

2025-08-03T09:44:12Z

added brief summary and fixed references

Louis: undid AI slop and mess

2025-08-02T20:48:31Z

undid AI slop and mess

← Older revision		Revision as of 20:48, 2 August 2025
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	~~{{Stub}}~~
	{{ProductCargo		{{ProductCargo
	\|Company=Sony		\|Company=Sony
	\|ProductLine=~~Sony~~ WF		\|ProductLine=WF-1000XM4
	\|ReleaseYear=2021		\|ReleaseYear=2021
	\|InProduction=No		\|InProduction=No
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	\|Logo=Sony.svg		\|Logo=Sony.svg
	\|Website=https://electronics.sony.com/audio/headphones/truly-wireless-earbuds/p/wf1000m4-Black		\|Website=https://electronics.sony.com/audio/headphones/truly-wireless-earbuds/p/wf1000m4-Black
	\|Description=~~The WF-1000XM4 earbuds~~ have ~~had issues regarding the~~ battery ~~performance after OTA~~ firmware ~~updates~~, ~~with them being very hot during charging cycles~~.		\|Description=Users have reported rapid battery drain and overheating in one earbud following firmware update v1.4.2, occasionally resulting in battery failure or casing damage.
	}}		}}

	==Consumer impact summary==		==Consumer impact summary==
	~~{{Placeholder box\|Overview of concerns that arise from the conduct towards users~~ of ~~the product (if applicable):~~		*'''User Safety''' – documented instances of earbuds overheating, swelling, & in some cases ''“popping open”'' during charging.
	* User Freedom		*'''User Freedom''' – battery life reduced to minutes on one side without obvious cause.
	* ~~User Privacy~~		*'''Transparency''' – Sony has not issued a formal recall; guidance varies globally.
	* ~~Business Model~~		*'''Service Access''' – warranty and out-of-warranty support has been inconsistent by region.
	* Market Control}}

	==~~Incidents~~==		==Incident==
	~~This is a list~~ of ~~all consumer protection incidents related to this product~~. ~~Any incidents not mentioned here can be found in the [[:Category:{{PAGENAME}}\|{{PAGENAME}} category]]~~.		Thousands of users, following firmware version 1.4.2 (released July 2022), have reported severe and uneven battery depletion, typically affecting one earbud. Most often the right. Symptoms include rapid discharge (for example, 1–45 minutes of playtime) and unusually high temperatures when charging.<ref>[https://www.reddit.com/r/SonyHeadphones/comments/x7mx2n/wf1000xm4_severe_battery_issues Reddit – WF-1000XM4 severe battery issues]</ref>
	~~{{Placeholder box\|Replace the placeholder text in the sections below with the incidents that affect this product~~ and ~~a short summary~~. ~~Also replace the link so it point to~~ the right ~~product line or company article~~.}}
	~~===Example incident one~~ (~~''date'')===~~
	~~{{Main\|link to the main article}}~~
	~~Short summary~~ of ~~the incident (could be the same as the summary preceding the article~~).
	~~===Example incident two (''date'')===~~
	...

	~~The video titled "Why you should never buy Sony earphones until they fix~~ battery ~~defects!" discusses significant battery issues~~ in Sony's WF-1000XM4 ~~earbuds, particularly after firmware updates. Users have~~ reported ~~severe uneven battery drain, with~~ the ~~affected earbud becoming excessively hot~~ during ~~charging~~. ~~The common factor appears to be the 1~~.4.~~2 firmware update~~.		===Reported battery failures and overheating incidents===
			At least four documented cases involve earbuds physically swelling or splitting open with audible “pop” and chemical odor while charging in the case.<ref>[https://thewalkmanblog.blogspot.com/2023/02/sony-wf-1000xm4-explodes-while-charging.html The Walkman Blog – Sony WF-1000XM4 explodes while charging]</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>[https://thewalkmanblog.blogspot.com/2023/07/two-more-sony-wf-1000xm4-battery-failures.html The Walkman Blog – Two more WF-1000XM4 battery failures]</ref>

	[https://~~www~~.~~reddit~~.com/r/~~SonyHeadphones~~/~~comments~~/~~x7mx2n~~/~~wf1000xm4_severe_battery_issues/?utm_source=chatgpt.com&rdt=65095 Reddit~~] ~~[https://archive.is~~/~~V0cUP Archived]~~		===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>[https://community.sonylatvija.com/t5/portable-audio/wf-1000xm4-sudden-battery-drain-issue-2-days-after-warranty/td-p/3873533 Sony Community Latvia – WF-1000XM4 sudden battery drain]</ref>

	~~'''Key points~~:~~'''~~		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>[https://www.notebookchat.com/index.php?topic=159996.0 Notebook Chat – Sony WF-1000XM4 battery drain issue]</ref>

	*'''~~Battery-drain issues:~~''' ~~Many users have experienced rapid battery depletion in one earbud, leading to significantly reduced usage time. [https://www.trustedreviews.com/news/simple~~-~~sony~~-~~wf-1000xm5-change-fixes-the-xm4s-only-real-flaw-4353122]~~		===Sony's response===
	*'''~~Overheating during charging:~~''' ~~Some~~ users ~~have reported that the affected earbud becomes unusually hot while charging, indicating potential battery damage. [https://community.sony.co~~.~~uk/t5/portable-audio/wf-1000xm4-really-hot-while-charging-with-the-right-bud-draining/td-p/3966523]~~		Sony's response varied by region:
	*'''~~Firmware-update concerns:~~''' The 1.4.2 firmware update is commonly associated with these battery issues. Users have noted that downgrading to earlier firmware versions may alleviate the problem, but this is not a guaranteed solution.		*'''Japan''' – offered out-of-warranty replacements and pickup service for affected devices until September 2023.
			*'''United States''' – some users received replacements beyond warranty; others were charged for repairs.
			*'''European Union''' – some consumers received coverage under statutory protections; enforcement varied between member states.

	~~'''Recommendations:'''~~		Sony has not issued a formal recall or safety advisory, despite documented incidents. Official firmware notes refer only to “significant differences” in battery usage.

	*~~'''Contact~~ Sony support~~:''' If you experience these issues, reach out to Sony's customer service for assistance. They may offer warranty replacements or repairs~~.		==Consumer guidance==
	*~~'''Monitor~~ firmware ~~updates:''' Be cautious with firmware updates~~. ~~Before updating~~, ~~check user forums and official communications for any reported issues related to the new firmware~~.		If one earbud shows significant battery drain relative to the other, or becomes unusually hot during charging:
	*~~'''Community feedback:''' Engage with online communities, such as Reddit's r/SonyHeadphones, to share experiences and solutions with other users facing similar problems~~.		*Stop using the earbuds immediately and contact Sony support.
			*Report firmware version and charging symptoms.
			*In some regions, free replacements have been provided even outside warranty.
			*Avoid continued use if overheating occurs.

			==Documentation and evidence==
			Reliable source reporting includes:
			*Large Reddit thread linking failures to firmware 1.4.2.<ref>[https://www.reddit.com/r/SonyHeadphones/comments/x7mx2n/wf1000xm4_severe_battery_issues Reddit – WF-1000XM4 severe battery issues]</ref>
			*Sony official community posts noting uneven battery drain and overheating.<ref>[https://us.community.sony.com/s/question/0D54O00007iqVLYSA2/can-sony-acknowledge-the-battery-issue-with-wf1000xm4-firmware-vers-142 Sony Community – battery issue acknowledgment]</ref>
			*Independent blogs documenting battery swelling and explosions.<ref>[https://thewalkmanblog.blogspot.com/2023/03/another-sony-wf-1000xm4-battery-failure.html The Walkman Blog – Another battery failure]</ref>
			*Reviewer coverage advising warranty claims.<ref>[https://www.dhrme.nl/sony-wf-1000-xm4-we-were-wrong/ DHRME – We were wrong about WF-1000XM4]</ref>

	==References==		==References==
	{{Reflist}}		{{Reflist}}

	[[Category:Sony WF-1000XM4]]		[[Category:Sony WF-1000XM4]]

Mr Pollo at 13:14, 2 August 2025

2025-08-02T13:14:57Z

← Older revision		Revision as of 13:14, 2 August 2025
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			{{Stub}}
	{{ProductCargo		{{ProductCargo
	\|Company=Sony		\|Company=Sony
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	\|Description=The WF-1000XM4 earbuds have had issues regarding the battery performance after OTA firmware updates, with them being very hot during charging cycles.		\|Description=The WF-1000XM4 earbuds have had issues regarding the battery performance after OTA firmware updates, with them being very hot during charging cycles.
	}}		}}
	~~{{Incomplete}}~~

	{{~~ProductPage~~		==Consumer impact summary==
	\|~~infobox_logo=Sony~~.~~svg~~		{{Placeholder box\|Overview of concerns that arise from the conduct towards users of the product (if applicable):
	\|~~infobox_1_key~~=~~Release~~ date		* User Freedom
	\|~~infobox_1_value~~=~~June 8, 2021~~		* User Privacy
	~~\|infobox_2_key~~=~~In production~~		* Business Model
	~~\|infobox_2_value~~=~~Yes~~		* Market Control}}
	~~\|infobox_3_key~~=~~Official website~~
	~~\|infobox_3_value=[https://electronics~~.~~sony~~.~~com/audio/headphones/truly-wireless-earbuds/p/wf1000m4-Black Sony WF-1000XM4]}}~~		==Incidents==
			This is a list of all consumer protection incidents related to this product. Any incidents not mentioned here can be found in the [[:Category:{{PAGENAME}}\|{{PAGENAME}} category]].
			{{Placeholder box\|Replace the placeholder text in the sections below with the incidents that affect this product and a short summary. Also replace the link so it point to the right product line or company article.}}
			===Example incident one (''date'')===
			{{Main\|link to the main article}}
			Short summary of the incident (could be the same as the summary preceding the article).
			===Example incident two (''date'')===
			...

	The video titled "Why you should never buy Sony earphones until they fix battery defects!" discusses significant battery issues in Sony's WF-1000XM4 earbuds, particularly after firmware updates. Users have reported severe uneven battery drain, with the affected earbud becoming excessively hot during charging. The common factor appears to be the 1.4.2 firmware update.		The video titled "Why you should never buy Sony earphones until they fix battery defects!" discusses significant battery issues in Sony's WF-1000XM4 earbuds, particularly after firmware updates. Users have reported severe uneven battery drain, with the affected earbud becoming excessively hot during charging. The common factor appears to be the 1.4.2 firmware update.
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	*'''Community feedback:''' Engage with online communities, such as Reddit's r/SonyHeadphones, to share experiences and solutions with other users facing similar problems.		*'''Community feedback:''' Engage with online communities, such as Reddit's r/SonyHeadphones, to share experiences and solutions with other users facing similar problems.


			==References==
			{{Reflist}}
	[[Category:Sony WF-1000XM4]]		[[Category:Sony WF-1000XM4]]

Mr Pollo at 13:13, 2 August 2025

2025-08-02T13:13:05Z

← Older revision		Revision as of 13:13, 2 August 2025
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			{{ProductCargo
			\|Company=Sony
			\|ProductLine=Sony WF
			\|ReleaseYear=2021
			\|InProduction=No
			\|ArticleType=Product
			\|Category=Earbuds
			\|Logo=Sony.svg
			\|Website=https://electronics.sony.com/audio/headphones/truly-wireless-earbuds/p/wf1000m4-Black
			\|Description=The WF-1000XM4 earbuds have had issues regarding the battery performance after OTA firmware updates, with them being very hot during charging cycles.
			}}
	{{Incomplete}}		{{Incomplete}}

InTransparencyWeTrust at 19:29, 2 March 2025

2025-03-02T19:29:33Z

← Older revision		Revision as of 19:29, 2 March 2025
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	[[Category:Sony WF-1000XM4]]		[[Category:Sony WF-1000XM4]]
	~~[[Category:Sony]]~~
	~~[[Category:Earphones]]~~

InTransparencyWeTrust: move product category to product page

2025-03-02T14:22:57Z

move product category to product page

← Older revision		Revision as of 14:22, 2 March 2025
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	[[Category:Sony WF-1000XM4]]		[[Category:Sony WF-1000XM4]]
			[[Category:Sony]]
			[[Category:Earphones]]

Waldo: Categorize according to Categorization

2025-01-31T10:18:16Z

Categorize according to Categorization

← Older revision		Revision as of 10:18, 31 January 2025
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	*'''Community feedback:''' Engage with online communities, such as Reddit's r/SonyHeadphones, to share experiences and solutions with other users facing similar problems.		*'''Community feedback:''' Engage with online communities, such as Reddit's r/SonyHeadphones, to share experiences and solutions with other users facing similar problems.

	[[Category:Sony]]		[[Category:Sony WF-1000XM4]]
	~~[[Category:Products~~]]

← Older revision		Revision as of 09:44, 3 August 2025
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	\|Description=Users have reported rapid battery drain and overheating in one earbud following firmware update v1.4.2, occasionally resulting in battery failure or casing damage.		\|Description=Users have reported rapid battery drain and overheating in one earbud following firmware update v1.4.2, occasionally resulting in battery failure or casing damage.
	}}		}}

			The WF-1000XM4 are true wireless earbuds designed by Sony. They were launched on June 8, 2021.

	==Consumer impact summary==		==Consumer impact summary==
	*'''User Safety''' – documented instances of earbuds overheating, swelling, & in some cases ''“popping open”'' during charging.		*'''User Safety''' – documented instances of earbuds overheating, swelling, & in some cases ''“popping open”'' during charging.
	*'''User Freedom''' – battery life reduced to minutes on one side without obvious cause.
	*'''Transparency''' – Sony has not issued a formal recall; guidance varies globally.		*'''Transparency''' – Sony has not issued a formal recall; guidance varies globally.
	*'''Service Access''' – warranty and out-of-warranty support has been inconsistent by region.		*'''Service Access''' – warranty and out-of-warranty support has been inconsistent by region.

	==Incident==		==Incident==
	Thousands of users, following firmware version 1.4.2 (released July 2022), have reported severe and uneven battery depletion, typically affecting one earbud. Most often the right. Symptoms include rapid discharge (for example, 1–45 minutes of playtime) and unusually high temperatures when charging.<ref>[https://www.reddit.com/r/SonyHeadphones/comments/x7mx2n/wf1000xm4_severe_battery_issues Reddit ~~– WF-1000XM4 severe battery issues~~]</ref>		Thousands of users, following firmware version 1.4.2 (released July 2022), have reported severe and uneven battery depletion, typically affecting one earbud. Most often the right. Symptoms include rapid discharge (for example, 1–45 minutes of playtime) and unusually high temperatures when charging.<ref name=":0">{{Cite web \|title=WF-1000XM4 - Severe Battery Issues \|url=https://www.reddit.com/r/SonyHeadphones/comments/x7mx2n/wf1000xm4_severe_battery_issues/ \|access-date=3 Aug 2025 \|website=[[Reddit]]}}</ref>

	===Reported battery failures and overheating incidents===		===Reported battery failures and overheating incidents===
	At least four documented cases involve earbuds physically swelling or splitting open with audible “pop” and chemical odor while charging in the case.<ref>[https://thewalkmanblog.blogspot.com/2023/02/sony-wf-1000xm4-explodes-while-charging.html ~~The Walkman Blog – Sony WF~~-~~1000XM4 explodes while charging]~~</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>[https://thewalkmanblog.blogspot.com/2023/07/two-more-sony-wf-1000xm4-battery-failures.html ~~The Walkman Blog – Two more WF~~-~~1000XM4 battery failures]~~</ref>		At least four documented cases involve earbuds physically swelling or splitting open with audible “pop” 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>

	===Underlying causes===		===Underlying causes===
	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>[https://community.sonylatvija.com/t5/portable-audio/wf-1000xm4-sudden-battery-drain-issue-2-days-after-warranty/td-p/3873533 ~~Sony Community Latvia – WF~~-~~1000XM4 sudden battery drain]~~</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}}</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>[https://www.notebookchat.com/index.php?topic=159996.0 ~~Notebook Chat – Sony WF~~-~~1000XM4 battery drain issue]~~</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 \|access-date=3 Aug 2025 \|website=notebookchat.com}}</ref>

	===Sony's response===		===Sony's response===
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	==Documentation and evidence==		==Documentation and evidence==
	Reliable source reporting includes:		Reliable source reporting includes:
	*Large Reddit thread linking failures to firmware 1.4.2.<ref~~>[https~~:/~~/www.reddit.com/r/SonyHeadphones/comments/x7mx2n/wf1000xm4_severe_battery_issues Reddit – WF-1000XM4 severe battery issues]</ref~~>		*Large Reddit thread linking failures to firmware 1.4.2.<ref name=":0" />
	*Sony official community posts noting uneven battery drain and overheating.<ref>[https://us.community.sony.com/s/question/0D54O00007iqVLYSA2/can-sony-acknowledge-the-battery-issue-with-wf1000xm4-firmware-vers-142 ~~Sony Community – battery issue acknowledgment]~~</ref>		*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 \|access-date=3 Aug 2025 \|website=us.community.sony.com}}</ref>
	*Independent blogs documenting battery swelling and explosions.<ref>[https://thewalkmanblog.blogspot.com/2023/03/another-sony-wf-1000xm4-battery-failure.html ~~The Walkman Blog – Another battery failure]~~</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 \|access-date=3 Aug 2025 \|website=thewalkmanblog.blogspot.com}}</ref>
	*Reviewer coverage advising warranty claims.<ref>[https://www.dhrme.nl/sony-wf-1000-xm4-we-were-wrong/ ~~DHRME – We were wrong about WF~~-~~1000XM4]~~</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/ \|access-date=3 Aug 2025 \|website=dhrme.nl}}</ref>

	==References==		==References==