Helo TC’s package is initially very appealing: the compact cardboard box has a small window to show off the black plastic and silver metal helicopter, which has four rotor blades and a balancing bar sticking out of its top, plus an ultralight body with just enough gears and electronics inside to handle several features: power, lighting, and of course flying. There’s a 180mAh battery inside, an on-off switch and charging port on the outside,…