Yeah, I'm definitely convinced that these level 1 tech support people just have no answers to give besides exchanging the unit. They have these "suggestions" they tell you try, so you get a nice 'placebo' effect of doing something...
The only way I see that a wall charger would help anything is if your USB port(s) were defective in some respect, and were not proving enough current. But you would, in all likelihood, be able to diagnose this pretty easily since most of us have a plethora of USB devices. This totally sounds like just bullshit they are told to say, just so they have something to say.
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Which USB port are you using? You have to know that USB ports ARE NOT all the same.
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As far as charging goes, all USB ports are pretty much the same. As the standard has evolved, the maximum allowed current per port has increased, but electrically the new standards are backwards-compatible. In the end it's as simple as:
"The USB 1.x and 2.0 specifications provide a 5 V (5Vą5%)supply on a single wire from which connected USB devices may draw power."
http://en.wikipedia.org/wiki/Universal_Serial_Bus#Power
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Some of them does not bring enough power to recharge or even to make an external hard drive function. On some external HD, they supply dual head usb in order to plug it in two ports at the same time to make more power.
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This just comes off as misinformation to me. It's not like in some cases you only need 1 USB port when you have a "good" one, and in some cases need both because that particular single port is underpowered. The device itself needs more power than ANY single compliant USB port can provide, by design.
In essence, the exact opposite of what you say is true... these dual-head solutions are necessary because ALL USB PORT ARE CREATED EQUAL, so to speak.
The Kobo doesn't fall into this category, so all this is moot anyway.