Hitech - Rechargeable Battery for Olympus Stylus 820 / Stylus 830 Digital Camera Replaces Olympus Li-40B / Li-42B digital camera battery For Olympus Stylus 820 / Stylus 830 digital camera. Li-Ion Rechargeable Battery; Capacity: 500mAh; Voltage:3.7V 100% compatible and meet or exceed original specifications Item described above available at Hitech merchant