Insten Replacement NP-20 Lithium Ion Rechargeable Battery Compatible with CASIO BATTERY EXILIM EX-Z3 S3 M2 Z4U S1 EX-Z75 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