Blake_ASUSI don't have any problem sacrificing another half-second for ssd power-up/power-down, in favor of battery life.
If you put the device in Standby or Sleep mode, your SSD would still be working.
So is many other function, that's why you are able to resume/wake up from sleep mode very quickly.
And that brings power consumption as well.
You are able to set the hibernation and hard disk power(might not be there for every model) in your power options.