My Syma x8c fell into about 6 inches of water, just enough to get water in the main compartment. When I try to fly it now, it won't take off. All the propellers seem to work, but they only rotate for a second before cutting off, at which point the bottom LED lights start to blink (similar to the dead battery lights). I've charged the battery and the indicator says it's fully charged. I've also tried recalibrating the drone to no avail. Is this simply a battery problem or is the drone internally shot?