Worked 18 days... after that ... BOOOOOOMMMM..... it jst bang my quad in air and bought it down ..... Battery destroyed as it was unable to expand on board due to discharging. But i saved my quad. I dont think that this thing is for beginners.... not balanced at all.. One cell is at 4.1V then other is at 3.8V ... I know that this is because of my balance charger... but still lipo should have self balance like that of MULTISTAR batteries do have...