User blog comment:Anakin Skyobiliviator/A little help, guys!/@comment-1956117-20120523003337

Holocron
Only Operation: Knightfall requires you to pick up a holocron, I believe, since only Jedi [and Sith] were involved with holocrons.

Power Cell
You only need to pick up a power cell in Amongst the Ruins. Although in Heart of Darkness, you have to pick up something for the destroyed AT-TE; I'm not sure if it was a power cell, but it shared a similar, if not the same, model.