Phonak 10 Thin Foil Technology battery, designed for use with Phonak Roger earpiece systems. Listed as a Phonak Battery accessory, it is documented as compatible with the Roger Earpiece and Roger Earpiece v2. The product page provides no data on capacity, chemistry, voltage, nominal runtime, or physical dimensions, and no charging or connector information. Consequently, no capacity or electrical specifications can be confirmed from the available source; the entry documents compatibility and the battery's accessory role.