| | Re: Kensington PowerBolt car charger
ok, with some more research it seems some USB chargers short the two middle pins to indicate that it's an "AC charger" and can provide more than 500mA of current. This is apparently USB spec.
Unfortunately Apple doesn't seem to follow this, so many aftermarket chargers that are designed to work with Apple stuff won't work with other components.
How frustrating that not everyone follows the same standard. I was hoping to have a single 12V DC adapter that provided USB ports so I could charge a variety of devices.