Some Q's on the quark BEC

[pinkpanda3310]

I got a quark relatively cheap and out of warranty so I figured it's the ideal specimen to do the mod.

My question is more related to the bec. I will be running 5s lipo and 6s2p A123 so I should use an external bec right? Can I direct solder a fan to the + and - of the reciever tabs? So the power would go to the fan not the reciever ( and pull the middle wire at the reciever end ).

With the fan drawing from the internal bec would it over work it because it's above the recommended voltage ( instructions say to use external bec when using more than 4s lipo )?

Finally, could I use the internal bec to power both the fan and the reciever safely?

Any help would be appreciated.