I use the exact combo recommended by 67685, and I couldn't be happier. I can get 10 flights in without even thinking about charging (though I wouldn't do that anyway, just saying I could). I picked the NMP over the Duralite because it was less expensive than the 1800mA Duralite, and weighed less, but most of the guys I fly with use the Duralite because they have a 2400mA that gives them a little more time between charges and they also fly in Masters and FAI, which can be demanding on the current draw.