I've had my Thunderbolt for about two years (a few weeks after it was released). My battery's getting old, so it's time for a new one.

I'm wondering if anyone has ordered batteries through Amazon's Warehouse Deals? I've ordered other things through them (like cases, screen protectors, chargers, etc) and it usually appears just to be an opened/damaged package. But, I guess there's no good way to tell "how used" some of those things might be, so I'm a little weary of buying a battery, where time depletes its strength. What are your thoughts/experiences?