Sony NP-BX1 X-Type Rechargeable Battery Pack

The NP-BX1 is the X-type lithium-ion battery used across Sony's RX100 series of compact cameras, the ZV-1 line and Action Cam camcorders. It is small, 25 g and under 10 mm thick, so spares disappear into a pocket, and with a minimum 4.5 Wh (1240 mAh) capacity a second pack roughly doubles a day's shooting on those cameras.

Maximum output is DC 4.2 V and the pack is rated for operation from -10 to +60 degrees C. Dimensions are about 29.9 x 9.2 x 42.7 mm. This is the /M8 retail version.