I suggest you start researching some electric PLANES that suit how you want to fly and look at the power systems used in them. Very general questions like how does everything fit with everything else are almost impossible to answer.

Anyway it's not really a good idea to start by looking at the detailed specifications of the internal parts. First decide what you want to do then find out how other people have done that. After this you can start worrying about the bits and pieces.

Steve