CASIO NP-20 Battery,550mAh 3.7V

http://www.sales-battery.com/digital-camera-batteries/casio-np-20.htm

Price:US $ 7.66
Chemistry: LI-ION
Color: BLACK
Capacity: 550mAh
Volts: 3.7V
Dimension: 50.90x32.80x4.50mm
Net Weight: 18.00g

Good News: Buy NP-20 battery and NP-20 charger together you will save more US $2.00 ! Replacement for CASIO Digital Camera Batteries NP-20 and Digital Camera Batteries battery Charger