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 :
Casio Exilim EX-Z500 Digital Camera Battery Lithium-Ion(1300 mAh) - Replacement for Casio NP-40 Battery - Walmart.com
1250mAh Camera Battery for Casio NP-40 NP-40DCA NP-40DBA DLI-202 BENQ E610 E520 | eBay
Synergy Digital NP-40 Lithium-Ion Battery - Ultra High Capacity (1300 mAh) - replacement for Casio NP-40 Battery | Camera Wholesalers
1500mAh Camera Battery for Casio NP-40 NP-40DCA NP-40DBA DLI-202 BENQ E610 E520 | eBay
Genuine Original CASIO NP-40 Battery For EXILIM EX-FC100 FC150 Z1000 Z1200 Z400 | eBay
Amazon.com : Power 2000 ACD-235 Replacement for Casio NP-40 Li-Ion Battery : Digital Camera Batteries : Electronics