I'm replacing a 144V 170Ahr 1100lb Lead-acid pack. Fwiw, I went with the Tesla S modules (22.5V per module, 135V for my six-pack, 350lbs, 233Ahr). I looked at every kind of cell, and chose the Teslas primarily because of the quality of the build and the built-in cooling. They are amazing examples of engineering, no other battery comes close particularly in cooling. If you can fit their size, do consider them. An Orion 2 bms is an excellent match.