Does Energy Charge require you to spend 5 points on it to activate, or does it activate per every 5 you spend on surges?

The adrenaline pool gets way too large in the end. At level 20, with a reasonable 240 pool from a +12 modifier, you can take 21 rounds worth of actions in one turn. If Energy Charge works the way I think it does, spending that all gives 48d6 damage on each attack. You can win intiative pretty easily, spend all your points, run up to all the enemies, whack them, and win the encounter before anything happens and so the penalty doesn't even matter. These abilities probably need more of a cap. Does sound pretty cool though. Do 2 minutes worth of actions in just 6 seconds, moving so fast you set everything you touch on fire.

For a suggestion of an ability, spending adrenaline points to take your turn during the enemies.