Any help or advise is GREATLY appreciated!!!

Just started flying, bought a Hobbico Cessna 182 that came with real fly 3.5 (really helped) I have become fairly sucessfull with the 182, landing it good, flying it good. But the problem I am having is with the battery, i htink. Twice it has just died in flight, one time I was able to land ok, but the other I was going into the wind adn when I lost power it fliped and crashed. I decided to upgrade to the Parkzone Corasair PNP. I bought the Spekrum DX6i and am ready to fly, but I havn't yet.

This is where I need help.
The battery is a parkzone 2200 3-cell
The Charger is parkzone charger (cheap one) I have orderded the triton new charger for 129$ thats does everything.

What I am not sure of is how long I should try to fly on my first flight so I don't run out of battery. I fly pretty fast so I guess Ineed to slow my thrttle down a bit.
Also I bought one of the no name batteries from China for 1/2 the price, antone have any experience with these?

Also ANY advise on anything would be greatly appreciated!