3S @ 12.6V = 4.2V per cell. Thats standard LiPoly, not LTO. 3S @ 9V = 3.0v per cell. Standard cutoff for LiPoly. And at that weight, I'd have a hard time believing that to be a genuine 100Ah. 12.6v @ 100Ah = 1260wh. According to Wikipedia, LiPo cells are 100-265wh/kg. Cells alone on top quality stuff would be 4.75kg. The control circuitry and case would bring it well over 5kg. Too many lies for this to be a trustworthy seller. You might get a 50Ah LiPo pack, you might get a box full of bricks and 3 x 18650s from an old laptop. Or you might get a fireball. My bet's on the fireball.