I have a Phantom 3 that I haven't used for about a year or so. I decided to dust it off and fire it up. I charged the battery and controller. To power on the drone I held the power on switch for about 2 seconds and then let go. All lights on the battery come on for about 3 seconds and then go out. As I recall the battery lights should cycle, then the power is applied to the drone. I figured that maybe I let the battery set too long so I bought a new one and that does the same. Press the power button, hold for a couple of seconds, let go. The lights stay on for about 3 seconds and then go out. The drone never powers on. I'm thinking now my phantom has died. What bothers me is that the last time I used it, it flew with no issues. Any thoughts out there?