2-Pack of NP-BY1 Batteries and Battery Charger for Sony HDR-AZ1 Action Camera NPBY1 Li-ion Battery for Sony HDR-AZ1 Action Cam Mini Battery Specifications - Energy Storage Capacity: 800mAh /Voltage: 3.7 volts, Chemistry: Li-ion 100% Memory Free Super Long Time Recording Battery has a one-year warranty Includes Qty 2 NPBY1 Batteries + Rapid AC/DC Battery Charger + Micro Fiber Cleaning Cloth