Fujifilm FinePix F660EXR Digital Camera Battery Lithium-Ion (3.7 v 1000 mAh) - Replacement for Fuji NP-50 Battery - Walmart.com
Original Battery Fujifilm NP-50 NP50 3.6V 1000mAh Genuine | eBay
Amazon.com: Replacement for Fujifilm F850EXR Battery and Charger with Car Plug and EU Adapter - Compatible with Fujifilm NP-50 Digital Camera Batteries and Chargers (1100mAh 3.7V Lithium-Ion) : Electronics