Here is a detailed installation of all the best mods for this little bat out of hell quad. Bearings, motors, JST connectors, motor venting, body mods for easy individual motor changing and battery door. Seems to fly smoother after the bearings. Seems like the bearings gave me an extra 2 - 3 minutes of flight time. The battery alone gave me about 11 -12 minutes and after testing with these mods It's up to between 14 and 16 minutes. I was amazed.