Exell 3.7V 4400mAh Li-ion Portable Speaker Battery Fits Polycom 1520-07803-004, Polycom Conferencing System, Polycom L04L40627, Polycom SoundStation 2W, Polycom SoundStation 2W EX, Polycom SoundStation2 Wireless Amperage: 4400mAh, Chemistry: Li-Ion Length: 5.150, Width: 1.440, Height: 0.720 Exell Battery MP3, iPod Batteries