You could have used that cryogenic power cell to repair Fassa's broken pylon's, but I wouldn't recommend wasting it, as computer spikes & computer skill can do the trick.
What the power cell is immensely useful for is, like you said, reparing the airspeeder. Not only do you get a huge amount of XP from reparing the bike, but there is also influence opportunities forboth Atton and Bao-Dur. As an added bonus, you get to use it to travel around Nar Shadaa.