"Switched power" generally means the power to your auxiliary chargers, lights, etc. won't be hot until you turn the key. I prefer to power my accessories this way. I have an old Centech AP-1 fuse block connected to my battery with a switched relay. The relay is wired to the battery and tapped into a wire on the bike that receives power when the ignition is turned on, usually a head- or tail-light. The fuse block receives power from the battery through the relay, all of my accessories are connected to the fuse block (except my old PIAA 1100 lights because they came with their own relay). This may be overkill if all you want to charge is a phone, but it's a good way to go if you want to add more doodads such as a GPS. I have an old "unswitched" relay cable lying around somewhere, but decided not to use it because it's really easy to drain the battery.
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