Hey I know I'm kind of new here too, but honestly it's a while to find the "sweet spot". Like you have to play with it and adjust the screw (you'll see what i'm talking about when you see the setup) until you finally get that sweet spot. I was unsure about which to get so I went with RT but now I'm going for the eGrip x7 style.
Don't get me wrong the RT has it's advantages, i mean you can use it underwater for crying out loud(youtube)! But on my last game when I needed fire power I had to wait until the RT was ready to spray . I like knowing that it's gonna give me what I need when I need.
About batteries... I guess it sucks buy batteries but you can't have it all...
The reason I'm going to the eGrip was that it came out in the x7 style which you can switch by flipping a switch .... (i think). Good luck man welcome aboard!
cal
