A friend of mine is unhappy with boost service in his house, and plans to return his Ultra. But before he does, he was kind enough to let me borrow it for the day to evaluate and see if I like it (I'm waiting for it to come out on Sprint next week). Here's the thing- he managed to let his battery go all the way down to dead. I don't have the charger, but I figured that's OK because it looks like a regular old USB charger. So I grabbed a microUSB from my Optimus, and plugged it into my PC. I saw the samsung logo come on, and then a graphic of a battery that I assume is supposed to look like it is charging. But then the screen goes dim, shuts off, and starts over again with the samsung logo. This repeats indefinitely unless I unplug it or try powering on the phone. When the phone is powered up, the battery is so dead it just displays a red X where the battery icon would be (I remember seeing that on other Android phones when the percent is less than 1). It seems to NOT be turning off while plugged in to USB, however it doesn't appear to be charging either. This is weird. I recall the old Windows Mobile Samsung Blackjack had something like this, where if you let the battery go too far, it won't charge back up without the real official wall charger. Something about the output being higher on the wall wart than a regular USB. Could this be the same? Will the phone refuse to charge if dead unless I go back and get the charger??