Bought a new DJI batter on Ebay a couple weeks ago. While waiting for it to arrive, I saw the $50 Game stop battery thread and picked up 2 more at Target. With the Ebay battery I now have 4. So far I've been fine using only 3 of the batteries. I haven't charge the Ebay battery yet. Can I leave it uncharged for a while until maybe one of the other batteries started to die or will I ruin it by not charging and using it?