CarbonTube flies over 1hour

This design's goal is to achieve 1 hour fly time, and after all I've reached 70min+ flytime with this build.

It is build from scratch with 3mm carbon tubes, that make the frame under 18g and rigid enough to freestyle. The second important part is the battery. I made a 5000mah 2s battery with 2 cellphone battery cell to get highest power density, because cellphone batteries have much higher discharging voltage and about 20% lighter than 21700 cells.

At last I flied this quad manually for 70 min because I don't want to add more weight install GPS.