My 1650s stay charged longer than I'd ever want to fly in a full weekend. Charged Friday night and at the field all day Saturday and Sunday with no recharge. I didn't count the flights or measure the 'on' time but there was never any reason to think it wouldn't go another time. Would a 600mah pack do the same? I have no idea.

I have gotten some really good deals on receivers and servos. Otherwise I'd probably just buy 4 channel radios, often cheaper than buying a flight pack, and use the 600 mah pack that comes with it. Since I have to buy a battery pack for each model anyway, I guess I'm willing to spend a little extra on batteries.