> "Powersave" means saving power, it doesn't mean saving energy. Your battery holds a fixed amount of energy, not a fixed amount of power. Energy is what matters.
Ignoring everything else, your battery doesn't hold a fixed amount of energy either. Or, if it does, it doesn't deliver a fixed amount. The energy you get out depends on the load. If you draw enough power that it heats the battery, you'll get less energy out. Of course, if you draw so little energy that self discharge becomes significant, you'll get less energy out.
As with the rest of the discussion, there's clearly a balance to be had, but it's hard to make the optimum choice because the systems usually don't know the load profile of (immiment) future work, and there are many systems that interact, and there may be no part of the system that has enough information to make an overall decision. That said, there's clearly been lots of progress on getting quite good results in most scenarios.
Ignoring everything else, your battery doesn't hold a fixed amount of energy either. Or, if it does, it doesn't deliver a fixed amount. The energy you get out depends on the load. If you draw enough power that it heats the battery, you'll get less energy out. Of course, if you draw so little energy that self discharge becomes significant, you'll get less energy out.
As with the rest of the discussion, there's clearly a balance to be had, but it's hard to make the optimum choice because the systems usually don't know the load profile of (immiment) future work, and there are many systems that interact, and there may be no part of the system that has enough information to make an overall decision. That said, there's clearly been lots of progress on getting quite good results in most scenarios.