A-Cas NP-40 Product Description:

Corresponds to Casio NP-40 (digital camera)
3.7 V/ 1200 mAh
for camera types Casio EX - Z 30 / EX - Z 40 / EX - Z 50 / EX - Z 55
EX - P 600 / EX - P 700 / EX-P 505
EX-Z 57 / EX-Z 750 / EX-Z 500 / EX-Z 700
EX-Z 600 / Z 850 / Z 1000

Ansmann replacement batteries meet or exceed manufacturer's specifications and are guaranteed to conform to the cameras or camcorders it is designed for.  2-year warranty