You could totally have something like Crysis' suit system for the augs. Have a bunch of passive ones that take up energy when used(jumping, getting hit, punching people, etc.) and others that drain energy when active. Then have the energy regenerate when you're not using any and make the challenge finding the most effective combination for a given situation instead of micromanaging a bunch of energy cells and worrying about using your flashlight too much.
Then you could have a efficiency vs power upgrade path for each, leading to either a slow strategic approach or a fast and aggressive one.