One sure fire way to extend your TX's operation indefinitely is hooking it up to the grid. Of course, the extension cord might be a bit on the 'LONG' side. Hee! Hee!
What I heard in the past involves FPV monitoring on the TX. FPV uses an enormous amount of power for the screen. I have heard that on some models a fresh battery pack often will not last for multiple (more than two) flights, so spare TX batteries are prudent. But that's what I've heard on this...
Sorry, I misunderstood. You wanted it for the transmitter then. I guess it depends on how much current the transmitter draws upon. Perhaps someone else, like Jackson, can help you.
From my limited experience, quadcopters have one battery designed for it and usually run on the time estimated for that battery. To get double the flight time will mean landing and changing out the spent battery for a fresh one. Adding a second battery to the quadcopter doubles the weight...
So, why all the restrictions on drones? Because of all the stupid things people have done with them in the past. Laws are created to stop other people from doing the things that other people did before the law existed. You can probably blame the inventors and manufacturers for these because of...
Gee, fly over the Grand Canyon, you can catch all the bad guys stealing canyon rocks (a federal offense by the way). Sorry, life has got to be less boring than that. By the way, your sentence construction seem puzzling at times.
Solution #1: Buy a new Tablet with the new iOS on it. Keep the old tablet with the old iOS on it for use with your drone. Just because Apple tells you to upgrade, doesn't mean you have to.
Someone who flies where trees and bushes are not in the way. The moon would be a good example of such a location. The Gobi Dessert is another good location.
One thought here which is applicable to fixed wing aircraft is that flying in cold air causes greater lift because cold air is denser than warm air. It may be the case that the rotors on the quads may be cutting into denser air thereby they are sluggish because of that. Of course, that may be an...
And then, crap happens, even when you think you've got all the bugs licked! It's the same with computers, they're big dumb boxes that depend on software making them run right. A bad program means the big dumb box stays dumb.
Never piss off a woman, especially if you expect to be allowed to live in the same house as they do. Fly the drone outside. It's safer for the drone and safer for you!
How about a suicide drone that attacks the attacker like an air to air missile? Before the attacker gets to fire the net the suicide drone crashes into it. I know that that is extreme but then it's a possibility. Watch out piggies.