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Amazon.com: 3.7V/80mAH Replacement Battery for Discovery 610, 640, 645, 650, 650E, 655, 665, 640E, 665, Voyager 815, 818, 835, 855 : Electronics
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Replacement Battery for Plantronics Discovery 665, 655, 650e, 645, 640 and 610 Headset. - Newegg.com
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