Battery wall charger worked right out the box on 1st charge, charged up the battery to 100%. Now it won't charge my battery. No led lights up on the charger or the battery when it's plugged in. Seems to me I have a faulty charger. Am I doing something wrong? I noticed battery level was down to around 25% while in flight and the phantom kept slowly descending without my input. I would push up for more lift, it would up slightly but still fight me and kept descending. Is it normal for the phantom to automatically descend when battery reaches a certain level? FYI - Ver 1.08 naza mode fc no winds and flying 20 ft over head, s1 and s2 in the up position, gps calibrated, 10 satellites, fpv was fine on my iPhone. Thanks in advance.