The batteries in my XM4s have very rapidly lost their battery life - Sony WF -1000XM4 Wireless Earbuds - iFixit
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Sony WF-1000XM4 Truly Wireless Noise Cancelling Headphone - Up to 24 hours battery life -Optimised for Alexa and Google Assistant-with built-in mic for calls, Black: Amazon.co.uk: Electronics & Photo
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Sony WF-1000XM4: Latest firmware update may worsen battery life for some earbuds - NotebookCheck.net News
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Sony WF-1000XM4 review: All-round audio excellence and now with Bluetooth multipoint | Expert Reviews
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