Peter Klementowski wrote:And well, I don't know what is wrong but it doesn't charge camera. The cabel occured to be 2.1 instead of 2.5 ( I think so) and it didn't match input socket. So I took a tool and gentle made a bigger hole inside socket and it can go inside the camera however it is very tight.
If you have to increase the internal diameter of the female socket, then it's the wrong plug, or poorly manufactured. DO NOT USE IT. You will end up damaging the camera's power plug as you force it on and off.
The correct internal diameter is 2.5mm, not 2.1mm. The plugs may look similar, as the outside diameter is identical, but they're different. I make my own after buying parts from an electronics shop. Cost me about $5 in parts.
What you have linked there is a USB 5V battery.
USB = 5 volts
It is NOT for powering ANY of the Blackmagic cameras. It's for charging phones and 5V USB accessories. BMCC, BMPCC, BMMCC all need a minimum of 7.2V. By plugging in 5V nothing will happen. There's simply not enough voltage to even start the camera, let alone do any intensive tasks such as recording.