That would be rather nice, 800 mA I believe.

If one wants to change that 2mm connector to microUSB-male, what where to buy a component to be soldered to that cable?

I've sometimes asked in couple of electronics shops do they have microUSB-male-connectors which could nicely connected to the small cable, but they haven't had those in stock.

I know there is adapter 2mm to microUSB, but I am not looking for that kind of solution but to replace the male connector at once to microUSB.