Power cells are key items in Jak and Daxter: The Precursor Legacy. They are used to allow Jak and Daxter proceed in the game. There's a total number of 101 power cells. You only need 72 power cells to complete the game though. Getting 100 power cells will unlock a secret ending when you are standing in front of the giant door on top of Gol and Maia's Citadel.
In Jak X: Combat Racing, power cells are used in the turbo dash event. You need to collect the most to win the event.
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