I have the 2400 mah li pols and I can tell you that I only needed to buy one, After about an Hour I got bored, Rested and still flew. It just keeps on going, I still don't know what times I will get as it got dark.
Standard motor prop. It was great to fly. I have a new tail made from correx which is far stronger and the wings are clipped.
www.rcwing.co.uk see slow stick stuff.
Rick