Just a couple quick, basic questions. I ordered 2 more sets of the self-tightening props (used with prop locks) from DJI. How do you tell when your props need to be replaced? I have the original set my Inspire came with...they seem to be in good shape...the unit flies fine...but I'm told all props have a certain shelf life...is there any simple way to determine when props need to be replaced? Also...maybe this is in the manual, so forgive me...what is the best practice to recharge my Remote Control? Should I let it run down to 30% or so? Is there a best practice for recharging battery on the RC? Thanks!