when i plug my ps3 controller into the ps3 it turns on and its fine. but when i take the charger out the usb slot the ps3 controller turns off, then when you try to turn it on it wont? and answers..

The first guy to answer pretty much said it right

I think the controller battery must be low and needs to remain plugged onto the PS3 in order for it be able to function wirelessly. It happens after some hours of nonstop gaming.