I just got going with one of these. 8 flights so far.

What is the charge rate thru the stock tx?
Will it charge during use? (manual says not to do it)
Is there an alternative way to hold batery in? (no velcro)
Which holes are you (beginners) using? I am a beginner
Does anyone get a batery down to much below 3.5 volts (resting) without a terrible power reduction first?