Agreed with the above statement.(Himadri Roy's statement)
Large diameter pitch props at lower KV ratings And 4000mah+ will easily give you around 15 minutes of flying time and decent thrust to carry this much payload....
With 11" prop it can produce thrust up to 1100gm or 1200gm.....That means 4 motors would be easily be able to carry around 4.5kg to 5kg(Which is somewhat meeting this condition/thumb rule for calculating total thrust needed , Assuming you wont be performing maneuvers ) This will give you stable flight.
But keep this in mind, Do not over use ur lipo battery.Use 80% of total charge.
In another words the Voltage ratings for each cell should be atleast 3.3v(and it shouldnt go down than this).......And u can use
https://www.sparkpcb.com/robotics/quadcopters/lipo-battery-tester-and-low-voltage-alarm.html to keep voltage in check....Or get a good Transmitter which can show you live status of battery.......