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The battery in the charging case consumes power while the headphones are in the charging case and the lid of the charging case is open. This is because the headphones maintain the status to accept the resetting and initialization. Close the lid of the charging case after setting the headphones in the charging case.
Note: Keep away from a magnetic wireless charger, a USB cable with a magnet, or any device that generates a magnetic force, as the detection of the opening or closing of the charging case lid can be affected by anything magnetic.