OI812, after reading through post #12, I suggest you concentrate on 1000 - 1800 mah Nicad / NiMH batteries. The biggies may weigh a couple ounces more but what the _ell? Some worry about a couple oz. servo/batt weight then add 5-15 oz. nose wt. Beats me.
I love the idea of never having to worry about a battery if I charge on Thurs/Fri and go fly all day Sat/Sun. or such. I am replacing those 600 mah tmtr. batts with 1500 NiMH and using 1000 -2000 mah in all planes of .25 and above. Never a worry about those night before or field charges.

If you go NiMH, be conservative with the charge rates. One club member recently destroyed a fancy transmitter with a FAST charge of 1500 mah NiMH. He said, "I have always done it!" Well, that transmitter definitely showed he "done it" that time!
A few weeks ago another CM that pushes the envelope was field charging a 2x00+/- mah Hydromax NiMH pack at 1000 mah. Bang, Bang, Bang, I suppose those 3 cells "Balanced" themselves. Blew the side out of a pretty Big Bird.

I'm not into electrics, but my club has 2 pattern pilots that went electric. I saw those $800 LiPos lose the magic smoke a couple times. One even found smoke and flames in the plane to let go after a rough landing. [sm=sad_smile.gif] I will stick with gas and glow. I notice one of those guys is back running glow.

Don't saddle your sport fliers with those 600 mah kiddie packs.

edit: typos