Answer:
They are "rechargeable batteries"
Explanation:
ATP from the light-dependent side is transferred to the Calvin Cycle, where carbon dioxide is joined with ATP to create sugars and other carbohydrates. "Rechargeable batteries" because after ATP is used, it becomes low on energy. So it is transferred back to the thylakoid, where it will be recharged with light and water. Going back to the Calvin cycle blah blah blah.
