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This might also explain why some users running 1.5.0 have reported the issue: if it was charged in-factory while running 1.4.2, overheated, and was upgraded to 1.5.0 prior to shipping, that could explain why the issue persists. I'm curious if maybe these ones never had 1.4.2 on them, and some of the users who reported issues with their 1.5.0 pair had them upgraded from 1.4.2 in the factory.ĮDIT : Another thought - if we're all experiencing some form of overheating while charging since upgrading to 1.4.2 (whether we catch it happening or not) this could be causing permanent damage to the battery in the affected earbud. Note: Several people have reported that the issue is still present on their warranty-replacement pair, so take my update with a grain of salt.ĮDIT : The new pair that shipped with 1.5.0 still hasn't experienced any issues with battery life or overheating. I'll update this after I try to drain the case/earbuds to 0%, charge, and test again. There's still a ~5% difference after a few hours of use, but that's probably due to the extra processing being performed in the right earbud. I'll let everyone know if the issue persists.ĮDIT : My brand new pair that shipped with 1.5.0 doesn't appear to be having the same issue (yet). New warranty-exhange earbuds arrived with firmware version 1.5.0 installed. I've reached out to a number of high-profile reviewers and they're tracking this issue separately and attempting to replicate it on their end.ĮDIT : Added lots of additional reports. They will replace them with a brand new pair under warranty, but I have yet to receive mine and test them.

I tried to bring this to the attention of Sony, but their call center managers unsurprisingly couldn't care less about escalating what could be a major issue. If we're seeing this much activity, it's safe to assume that this is a much bigger problem than represented by this subset of users. See my running list of reports here (has not been updated since Sep 2nd, 2022 - there are now thousands of reports): Each post has numerous additional reports in the comment section. The most concerning symptom that some users have been reporting (myself included) is that the affected earbud is now getting hotter than expected while charging in the case.

The common factor appears to be the 1.4.2 update.

Starting at the end of July, there have been a large number of reports of severe uneven battery drain in the WF-1000XM4 earbuds. PLEASE READ THE LATEST UPDATES AT THE BOTTOM OF THE THREAD.

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