I just got my xbox 360 2 weeks ago and i cant use it without plugging it in (it has chargable battery pack) i charge it for LONG periods of time but when i unplug it and play the most it lasts is 2 minutes
Make sure that when you plug it, the little light turns RED. If it turns green too fast, it means it is NOT charging!! Try plugging and unplugging it. I actually saw a video where a guy said that if this happens it might mean your controller is completely drained, even so much as to charge itself, so what you should do is plug it, wait for the light to turn red, then when it turns green unplug it and plug it again, and then continue this process for several instances until it is able to charge itself! Hope this helps!!
i accually have the same issue with my conntroller, but thats probually because Iv had mine for 2 years instead of 2 weeks lol sorry man