In Stock. Polycom Cordless Phone Battery Li-Polymer Battery fits Polycom, Spectralink 8400, Spectralink 8450 3.7V, 1800mAh CS-SPT845CL $42.21 The quality and the performance of the products from Cameron Sino is literally amazing. Good quality is assured as the products are manufactured to a very high standard Finding the correct battery for your device can be difficult. There are a huge range of models and part numbers and it can be confusing. Believe us when we say its easier to reach out to... Add to cart