On Gen II's the electrical output is good for low amp devices. Some have connected higher amp device such as a tire pump and blown the fuse.
I have charged my phone and Ipod up there but it is not very hot in Washington State.
On my bike I have an connector near the triple tree. I use it for a lot of different thing including my Gerbing clothing, Battery Tender, air pump and charging my phone and Ipod. I just toss the phone and Ipod in the tank bag when charging.
Snack bars stored in the accessory box will melt.