Good care of your flight batteries is well documented. If you leave them full for too long, they even self-discharge to protect themselves so they're not left fully charged for long periods. But wouldn't the rechargeable batteries in the controller and any rechargeable monitors etc also be LiPo and therefore also need the same rules applied? Even things like the iPad's are probably using these kinds of batteries, but at least they rarely get turned fully off so are always slowly discharging. I ran all 3 batteries down to just over, or just on, 30% yesterday while flying. I probably won't get to fly now till the weekend, so probably won't charge them at all till Friday, they should be ok at that percentage till then, but the controller is showing 3 out of 4 bars. I was going to charge that so there's one less thing to charge on Friday, because I currently only have one charger, so it's a slow process, but it made me wonder if I should treat the controller the same way as the flight batteries and also leave it at less than full while ever I'm not using it.