Features:

• Never run out of battery power when you're just about to capture the perfect moment! Time to get extra power for your digital video camera/camcorder.
• High capacity, rechargeable DC 3.7V Li-Ion battery with premium Japanese cell.
• Latest Lithium Ion battery technology gives the best performance possible compared to other battery technologies such as Nickel Metal Hydride (Ni-MH).
• For use with Casio
• Best replacement for the original NP-20 (NP-20DBA) battery pack

Editor Reviews:

Product Description:
Compatible with model: Casio Exilim EX-S600 / EX-S600d, Exilim EX-S770, Exilim EX-Z60, Exilim EX-Z70 / Exilim EX-M1 / EX-M2 / EX-S1 / EX-S2 / EX-S3 / EX-Z3 / EX-M20U / EX-S20U / EX-S2PW / EX-Z4U / EX-S100 / EX-S500EO / EX-S500GY / EX-S500WE / EX-S500/EX-Z77

Rating : - Awesome!
I'm amazed that I managed to get this little thing for only $6 and some change (including shipping). So far it works fantastic! And compared to the $40+ of the Casio battery, it's a steal!