esc-fan propperly wired?

[snook]

Hey

I recently bought a second-hand esc. Its a Nosram matrix evo spec racing with optional heatsink and fan mounted.

While installing i noticed that the little 30ish-mm fan is wired directly to the positive and negative sockets for the battery.
So basicly the fan gets its power directly from the 5Amp 30c 2s lipo im running. I don't know any more about the fan, it doesnt have a sticker on it or something that would tell me how much volt it needs.

1. Question:
Can i leave it like this? Or will the little fan eventually burn out.
2. Question:
Can i rewire the fan to a empty reciever slot and it'll do?

snook