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Shelly - Yes, the battery of the cordless headset on the VTech DS6771-3 is replaceable and it uses a 3.7V 140 mAh Li-ion battery. To order the compatible battery for your headset, you may contact our Customer Support between the hours of 7:00 AM to 4:00 PM Pacific time, Monday through Friday at 1-800-595-9511. Thank you, -VTech Support
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