I had a 9.6 1300 quit on me after 3 hours of moderate shooting... maybe about 1000-1500 rounds, it was fully charged. I got another battery, same voltage, longer mah (4000) and so far so good. I did a lot more shooting over the span of 14 hours and probably closer to 2000 and it is still going strong. I'm going to put it back in the gun this weekend for a game to see how much more it will do.
I have a feeling though, that I'll be rewiring everything to deans eventually to facilitate emergency battery swapping/lending.