eForCity? NP-20 Battery Compatible with CASIO Exilim EX-Z75 EX-Z77 Camera Best replacement for the original NP-20 (NP-20DBA) battery pack. Latest Lithium Ion battery technology gives the best performance possible compared to other battery technologies such as Nickel Metal Hydride (Ni-MH). 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. Weight: 1.0 oz.