eGo-T is the name given to it by the manufacturer. You will find the same thing re-branded, but it's just marketing...
With that said, the eGo batteries come in a variety of flavors, sizes, colors, etc.... so be careful when comparing. A 650 mAh eGo is NOT the same thing as a 1000 mAh eGo with USB passthrough capabilities, and the latter cost nearly twice as much...
Edit: Not LITERALLY various flavors... just a turn of speech...