Note: Please do not post unless you're interested in the battery, thanks. Feel free to PM if you don't want to post in here. Btw, I've heard this works in not only the EVO 4G, but also the Touch Pro2 and other recent HTC devices (you'll have to look that up).
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I purchased a 1750mAh Seidio extended battery for my HTC EVO 4G, but I realized soon after that I don't even need it. It's still in its original packaging and has not been opened/used.
If you're interested in this battery, which retails for $50, let me know. I'll let it go for $40 shipped. That's a savings of $10 + however much they charge for shipping. I only accept paypal as payment, thanks.
Picture of item attached below.
More info about it from Seidio:
Innocell 1750mAh Slim Extended Life Battery For use with HTC EVO 4G