How do I replace the remote control batteries?
Open the battery compartment on the back-bottom of the remote control by sliding the battery door in the direction shown by the arrow. Replace the old batteries with 2 type AAA-1.5V batteries, ensuring the + and - ends line up correctly, then slide the door back until it clicks. Remove the batteries if you are not using the remote control for a long time.
From the official Sony WH-1000XM4 Wireless Noise-Canceling Headphones manual, page 6
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