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FiiO BTR3K Replacement Battery 3.7V 280mAh Li-Polymer Warranty:Warranty 3 Year Running one complete charge-discharge cycleFiio BTR3K 3. 7V Li Polymer Replacement Battery This is a 3. 7V 280mAh Li Polymer battery for the Fiio BTR3K portable Bluetooth DAC and amplifier. It fits the BTR3K directly. Use the capacity figure from this listing 280mAh not third party sources, which vary. BTR3K platform fit: The BTR3K runs a single cell Li Polymer configuration at 3. 7V nominal. This cell matches that voltage rail and the physical dimensions (32. 00 17. 40 5. 70mm) required by