This may be a dumb question, but I'm new to this topic so please forgive my ignorance.. I'm looking to buy an external power source for my flash (YN565ex II). Here is my question; once it's connected to the flash, where does it go? Does it just dangle? Heh. Are the cords typically long enough to reach a shirt or pant pocket? Does it mount to the bottom of the camera like a battery grip?