http://camcorderbattery.ca/camcorder-batteries/panasonic-cga-du21.htm

Replacement PANASONIC CGA-DU21 Camcorder Batteries

-Item Number: ECPS019K
-Chemistry: LI-ION
-Volt:7.4V(Compatible with 7.2V)
-Capacity: 2000mAh
-Dimension:41.42x36.05x42.05mm
-Net Weight:95.50g
-Color: BLACK