I think here we have contradictory competing concepts (and my injury is entirely conceptional). And I could swear that some earlier Traveller version let you use black globe capacitors to power a jump drive without using jump fuel... but that's probably a Chat-GPT-level hallucination.
Not that I know of. CT Book 5 has this though:
"If a ship absorbs enough energy to make a jump, and is supplied with sufficient fuel, it may jump at the end of the turn."
So if their power plant is damaged, Globe charged up capacitors can fill in. Fuel is still required, as it is for the X-Boat. Whose description says is charged up by the power plant on the X-Boat tender.
High Guard is where the requirement for a ship to have a computer rated the same as the jump number was introduced, by the way, and is probably why the Traders and Gunboats X-Boat listing has a Model/4 and a Model/1bis listed in different places. The latter was legal under 1977 Book 2 for J-4; by 1980 (and made explicit in the 1981 Book 2) the former was required.
Other things mentioned in Book 5:
"Because of the delicacy of jump drives, most ships perform maintenance operations on their drives after every jump. It is possible for a ship to make another jump almost immediately (within an hour) after returning to normal space, but standard procedures call for at least a 16 hour wait to allow cursory drive checks and some recharging."
"Any jump, regardless of number, takes approximately one week (150 to 175 hours); ships in jump space are untouchable and cannot communicate with other ships or stations. Although jumps are usually made at low velocities, the speed and direction which a ship held prior to jump is retained when it returns to normal space."
"Tech level requirements for maneuver drives are imposed to cover the grav plates integral to most ship decks, and which allow high-G maneuvers while interior G-fields remain normal."
And my very favourite bit, which MegaTraveller ignored to its detriment:
"The ship design and construction system given in Book 2 must be considered to be a standard system for providing ships using off-the-shelf components. It is not superceded by any system given in this book; instead this book presents a system for construction of very large vessels, and includes provisions for use of the system with smaller ships."
I LIKED that regular civilian ships were handled by the simple design sequence. This also provides support for not needing to bother with local TL for Book 2 ships. All the parts are "Imperial standard" manufacture and are probably manufactured at an industrial hub like Mora or Glisten anyway.