Synergy Digital Amplifier Battery, Compatible with Fiio AEC644690 Amplifier, (Li-Pol, 3.8V, 4000mAh) Ultra High Capacity, Replacement for Fiio AEC644690 Battery
Specifications:
Battery Chemistry: Li-Pol
Voltage: 3.8V
Capacity: 4000mAh
Compatible with: Fiio AEC644690 Battery
Works for: Fiio AEC644690 Amplifier and many more