The NP-BX1 Rechargeable Lithium-Ion Battery Pack from Sony is designed to replace the original NP-BX1 battery. It is rated at 3.6V and features a capacity of 1240mAh.

Sony NP-BX1 Features
Shoot up to 330 photos or 80 minutes of video
Don’t miss a precious shot due to a dead battery. Just slip this NP-BX1 LITHIUM-ION N battery into your pocket or camera bag and rest assured you’ll be ready to capture the action when the moment arises.
Shoot up to 330 photos or 80 minutes of video on a fully-charged battery. Designed for use with several Cyber-shot cameras and Sony Action Cam.
Stay powered longer while on the go with this rechargeable battery pack for your compatible Cyber-shot camera or Action Cam. Shoot up to 330 photos or 80 minutes of video