About this replacement
Designed for Polycom, SpectraLink devices. Compatible models include Spectralink 8400, Spectralink 8450, Spectralink 8452, Spectralink RS657, 8400, 8450, 8452, RS657. Replacement part numbers include 1520-37214-001. Key specifications: 3.7V, 1800mAh, Li-Polymer.