I'm just about ready to give up on my Ego-T. How are these Mega Smart Carts 2.0. They look pretty good. How do they compare to the Regular Smart Cart 2.0.....aside from holding more liquid....are they the same? I'm interested, more in the Regular Smart Cart 2.0 because 510 atty's are easier to get.....not to mention a little less expensive. I've got a ton of Ego Battery's and I don't want to start from scratch if I don't have to.