1pc VARTA CP1254 A3 Battery For Sony WF-1000XM3 WF-1000X WF-SP700N Headphone
CP1254 (A3). Remove the old battery, carefully install the new battery on the battery box, tighten the screws, and then connect the wires of the new battery. Then unscrew the old battery screws one by one, and carefully save each screw.