Battery Replacement Instructions for Plantronics Wireless Headsets CS510/CS520, Savi W710/W720, Savi Office WO300, WO350, CS351N, CS361N All of these over-the-head models share a common battery compartment design and use the same battery. The part number for the replacement battery (w/removal tool) is: 64399-03. The battery should be replaced when it no longer holds a charge [...]
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