Wasabi Power Battery (2-Pack) and Charger for Casio NP-40 - Walmart.com
Amazon.com : Kastar NP-40 Battery Replacement for Cas Exilim EX-Z1050 EX-Z750, Kodak LB-060 AZ521 AZ361 AZ501 AZ522 AZ362 AZ526, HP D3500 SKL-60 V5060H V5061U and SUN06 YCO6 Full HD Portable Camera :
Np-40 Cnp40 Np40 3.7v 1500mah Digital Camera Battery For Casio Exz30 Z40 Z50 Z55 Z57 Z750 Ex-p505 P600 P700 Pm200 Camera Battery - Rechargeable Batteries - AliExpress