Yup, order a standard Rezound battery. Not quite the power the "extended battery" but definitely an improvement over the stock TB battery and fits just fine with the normal cover.
You may notice some strange behaviour when charging (i.e. phone stalls a certain percentage then jumps all the way to 100%), but appears to be both normal and non-damaging to the device.
I've been using a Rezound battery for several months now. Used to carry multiple batteries with me because I refused to use that huge extended battery...now I find I really don't have to anymore (except for when I'm camping for 24+ hours).