I've searched and searched for this info and can't find anything so here I am calling on all my helpful friends for an answer. I read the instructions that came with it and it said a two hour charge is needed for a fully discharged battery but nothing about the first time charge. I'm going nuts here wanting to try it out and it's been charging for nearly 4 hours and still isn't green. Do I need to wait for the green light or is the Ego like the 510 in that the batteries need no training. I don't want to mess up the life of it if it needs a really long charge before I use it for the first time but sitting here staring at that red light and wanting to dive into it is almost more than I can stand! Help!