Portable regenerator

From Memory Alpha, the free Star Trek reference

A portable regenerator is a device that allows Borg regeneration without the use of an alcove.

In 2376, when it seemed Icheb would be returning to his parents, Seven of Nine provided Leucon with a portable regenerator and an adapted neural transceiver, so that Icheb could regenerate on the Brunali homeworld. (VOY: "Child's Play")