Rule of thumb is that you lose 1 second of flight time for every extra gram of weight. I believe that the guards weight 90 grams so a loss of 90 seconds flight time is about right.
720p is only achieved when the bird is about 10 ft away. The video compression seems to take it well below that quality when you get any distance away.
Sounds like something else is going on here and not just pilots forgetting to seat the battery properly. How else do you explain this error with a confirmed properly seated battery. I think some of us don't want to acknowledge the truth!
I started getting lag for no apparent reason. Smooth for first couple of weeks ownership but stuttering ever since. I live in uk and haven't seen temperature above 18c at all yet so that ain't the problem. Not upgraded app or firmware either.
I have also started to have this problem. Looks like a few people are also posting YouTube videos about it. Just started without any particular reason so not sure of cause. Not changed firmware or viewing device.