Casio NP-40 Battery for EXILIM Cameras Replacement battery for the Casio EX-P505, EX-P600, EX-P700, EX-Z30, EX-Z40, EX-Z50, and EX-Z55 Lithium ion chemistry free from memory effect Capacity: 3.7-volts 1,230-mAh power rating Great as a backup battery