Delete comment from: Ken Shirriff's blog
Cefn: I took apart my orange charger, although I don't know if it is the same as the ones you are using. Here's an internal photo and here's the circuit board. It's pretty dodgy - there's no isolation gap between the primary and the secondary. The contacts from the power plug are right above the USB plug; they put Kapton insulating tape over it, which is good. But they put it crooked so it doesn't accomplish anything. So it has the usual safety problems of cheap chargers.
As for providing 1A: when I measured the charger, it didn't provide 1A but shut down cleanly well before there. However, I was measuring with 120V, so it might do better with 240V. There shouldn't be a safety issue with overloading it; even cheap chargers are designed to limit current and then shut down under overload.
Dec 19, 2016, 9:10:32 PM
Posted to A dozen USB chargers in the lab: Apple is very good, but not quite the best