Transwarp cell

A transwarp cell is a device used to power a starship through transwarp.

Fiction

Beast Wars

Transwarp cells were neccessary for use in travelling through transwarp space. It appears that it was difficult to manufacture a transwarp cell from scratch, as the Maximals (and Tarantulas) had to steal transwarp cells from the Darksyde, which Megatron kept under tight security. Victory Before the Storm

From Teletraan I: The Transformers Wiki, a Wikia wiki.