Rechargeable Battery Compatible with Olympus LI-40B Works for Olympus FE-190 Recorder and many other models Li-ion, 3.7V, 660mAh This battery is made with high quality Japanese cells, it is designed to meet or exceed the original battery performance. Long Lasting, Ultra Hi-Capacity Battery - Limited 3-Year Warranty

Synergy Digital Recorder Battery, Compatible with Olympus FE-190 Recorder, (Li-ion, 3.7V, 660mAh) Ultra High Capacity, Replacement for Olympus LI-40B Battery

Specifications:
Battery Chemstry: Li-ion
Voltage: 3.7V
Capacity: 660mAh
Compatible with: Olympus LI-40B Battery
Works for: Olympus FE-190 Recorder and many more