Hi there. I am a proper drone novice so please bare with me. I bought the spark drone a couple of years ago and had some fun with it then put it in a cupboard and essentially forgot about it. i recently tried to get it started up again but when I tried to turn it on there was nothing happening. I assumed it was a flat battery so charged it and the lights on the battery seemed to show it was charging. However I then went to turn it on a couple hours later and nothing. Not even a single light. Any ideas?