I bought the external charger / dual battery set mentioned in the first post...overall I'm quite pleased.
It took only 2 weeks to get here from Hong Kong...I've bought a bunch of stuff from there and believe me 2 weeks is fast!
The batteries look and feel solid, pro-jobbies, not knock-offs or imitations. The whole set looked very professional...too professional for only $10. (lol) Below is the one of the new batteries compared to the original:
http://dl.dropbox.com/u/9155488/2.jpg
http://dl.dropbox.com/u/9155488/3.jpg
The charger has a handy cut-out for your finger at the bottom, making it easy to retrieve charged batteries. And while the battery has 4 contact plates on it, the charger has only 2 charging prongs. Strange, but I suppose they need only the 2. Despite the "Touch Pro2" label, I've had no trouble with the set.
http://dl.dropbox.com/u/9155488/4.jpg
It does come with a USB connector, and while I've tested it only once, it did lock up my phone. If you attempt to charge the battery while it's in the phone the orange charge light will come on, but the phone will become unresponsive.
I'm quite annoyed at the placement of the power outlet prongs, on the back near the top. As you'll see in the next pics, it makes placement of the charger awkward unless you connect it directly to a wall outlet. No brainer for most people, but the prongs on the charger on my daughter's NDS rotate 90 degrees and I guess that's spoiled me. If the prongs on this were rotatable, or if they were on the end, I could set the charger on its back, with battery on top. I just like it better that way for some reason.
http://dl.dropbox.com/u/9155488/5.jpg
I was pleasantly surprised to see the huge power light indicator. It turns blue to indicate power, and magenta to indicate charging. Neat.
http://dl.dropbox.com/u/9155488/6.jpg
http://dl.dropbox.com/u/9155488/7.jpg
I'm also pleased to see the words EVO 4G on the battery label...IMO it's always better to buy things that were intended for your device, not just some universal model of accessory.
For $10 this is a steal.