In recent years the number of devices that we need to charge daily has constantly grown. Initially it was just our two cell phones. Since they each had unique power connectors each had its own AC adapter that lived near the appropriate night stand. Simple enough. Tidy even.
My Blackberry Bold 9700 was the first cell phone I used the featured the newly common micro-USB power connector. Shortly thereafter we added a Barnes & Noble Color Nook. Both of those devices require high-current chargers, where “high-current” means more than the 500 mA that is actually part of the USB standard.
That’s when things started getting more complicated. We may have achieved standardization of connectors, but still required dedicated chargers for some devices.