How do I replace the batteries in my remote control?
Slide the battery door on the back-bottom of the remote control in the direction shown by the arrow. Replace the old batteries with 2 type AAA-1.5V batteries, making sure the + and - ends line up correctly. Reposition and slide the battery door back until it clicks. (Page 5)
From the official Sony WH-1000XM5 Wireless Noise-Canceling Headphones manual, page 5
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