Stage two of three trophies tied to the collection of Scout Flies. As you will need the Power Cells from the Scout Flies for the final ending, you might want to make sure you complete all of the areas when you come across them. The earliest you might get this, if you take into account the four mentioned in:
Collect the remaining Scout Flies in:
The trophy will be yours by then. If you are unable to collect all 7 in each area up to that point, you might end up getting this trophy with an incomplete collection in previous areas by going to later areas, such as the Lost Precursor City, Boggy Swamp, or Precursor Basin.
The other trophy in the series is: