In Stock. Phonak Wireless Headset Battery Li-Polymer Battery fits Phonak, Compilot, Compilot Ii 3.7V, 300mAh CS-PCT200SL $28.71 Our battery should have the same special dimensions and design as the original battery, the fit and finish is checked to be as close as possible to the original model before dispatch. Finding the correct battery for your device can be difficult. There is a huge range of models and part numbers and it can be confusing. Believe us when we say it's easier to... Add to cart