I set up my tablets so the screen goes off 1 minute after switching from AC to the battery so if I have to make a quick run into the store or get gas its still on. My tablets run RR and the powermon plugin so as soon as the tablet switches from AC to the battery whatever is playing is paused/muted until AC is returned and then it unpauses/unmutes (instant on right where I left off). My battery's good for 4 hours so I have my power setting set to dim the screen 1 minute after AC power loss, 1 or 2 hours later (I change it whenever the need arises) go to standby, and when the battery gets to 10% remaining it powers back up and hibernates (usually 6-8 hours). The battery gives you additioal options - you might as well take advantage of it.
????? This one confuses me. If the USBs are always on, won't a Fusion Brain also always be on and you can use it to control relays powered by the car battery???