Hope this is the right place for this request for info.

I have an EZ-Star ARF which came with a Hi-Tech Neon 3ch Tx, a Permax Speed 400 6v which I upgraded to a 400 7.2-9v and an 8A ESC. I put standard Alakline Energizers in my Neon Tx the first time and they lasted pretty good. The second set lasted less than a week, mabey 4 flights. Today I put Energizer 2 Titanium Alkaline's in and they didn't last more than 5 minutes. I measured the voltage today in the batts and they are good as new with 1.5v. I also saved the old batts and they measure 1.2v each. Is there something in the Neon not working properly?

As I mentioned, I also put a speed 400 7.2v in my EZ-S and it flew great for less than 5 minutes then cut out. Do I need a different ESC? Was it because the batteries in my Tx went low? I am using 8 cell 1100mA 15c.

I wanna fly!

Unless you are measuring the voltage of your batteries under load, then your voltages do not tell you much. A battery that is just about dead will read it's nominal voltage.. until a load is applied and it can't keep up with the current draw...thats when the voltage drops. About the only thing you can do is get a meter that will read the current draw of the TX (like a "watts up" meter... a good investment if you want go get into higher powered electrics)... It shouldn't be more than 1 to 1.5 amps... and really it should be around .5 amps but some of the cheaper equipment seem to burn power for no good reason. I think those high power alkalines are good for like 2000+mah.. so if you burned them up in 5 minutes that means it is pulling over 20 amps.... I can't see a transmitter doing that not melting something...let alone work properly.
At this point I would say your best bet is to buy a package of batteries and put a full fresh set in and see how long it lasts.