Generally speaking, when I take my phantom out, I bring it home, then immediately recharge the batteries. I'm still in the initial phases of ownership, so I take it out every few days. I don't see the need to drain the batteries to 1/2 for storage for such a short period... BUT... Because I unplug the batteries after charging them and let them sit, before I head out for my next flight, I like to top them off with the charger one more time. In other words, I charge them to full, then let them sit for a few days, then top them off one more time before I head out. Is this destructive to the batteries? Should I just let them sit empty (from the previous run)? Or should I not worry about topping them off before heading out?