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Amazon.com: Synergy Digital Wireless Headset Battery, Compatible with Plantronics W440 Wireless Headset, (Li-Pol, 3.7V, 140 mAh) Ultra Hi-Capacity, Compatible with Plantronics 82742-01 Battery : Electronics
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Amazon.com: Replacement for Plantronics CS50/CS55 Headset Battery 65358-01 64327-01 64399-01 Compatible with Plantronics CS510 CS520 Savi W410 W420 W710 W720 Wireless Headset CS60, Pack of 2 : Electronics
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Amazon.com: Compatible Plantronics Battery Replacement for CS540 and C054 Wireless Headsets : Electronics
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Amazon.com: Merritt Compatible Plantronics Battery Replacement for C052, CS50, CS55, CS351n and CS361n, CS510, CS520, W710 and W720 Wireless Headsets : Electronics
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