TheNP-BX1/M8 Rechargeable Lithium-Ion Battery PackfromSonyis designed to replace the original NP-BX1 battery. It is rated at 3.6V and features a capacity of 1240mAh.
Camera Compatibility
Cyber-shot: DSC-RX100 DSC-RX100 II DSC-RX100 III DSC-RX100 IV DSC-RX1 DSC-RX1R DSC-HX300 DSC-HX50V DSC-WX300 DSC-HX400V