I purchased a used phantom 2 plus from B+H. Good price with a great warranty "$749.00". I unboxed it and the battery had 2 bars. Great I charged it till the LED's went out. Took off the gimbal guard inserted the battery and pressed the power button, The led lit up for about 4-5 seconds and then the battery cut off. The phantom does not power up any suggestions other than sending it back?