File this one under the "annoying but not critical" category.
When my phone is at 5% or higher, anything will charge it... car, wall, USB, solar. Wall's definitely the fastest, but they all work.
When it gets down below 5%, it's almost like it goes into a downward spiral that can't be stopped by a mere USB cable. It HAS to get plugged into the wall or it WILL die.
Once my phone is dead, it will not start for even a second. Screen won't even light up. At this point it is in a state where only the wall charger can save it. Once I put it on the wall charger, it's up to 5% in a few minutes, then 10%, then 20% within 15 minutes, but try charging it via USB and I get nothing.
What does happen occasionally when plugged in via USB is it will just start up when plugged in via USB and go to "Bootloader D0.11" and continually flash "Battery Low: Cannot Program". it does this at random intervals, and also when I turn it on manually. The only way around it? Plug it into the wall.
Also, not sure if this is related or not, but on about one in three reboots it goes to clockwork mod recovery. (it does it when not plugged in, plugged into wall, or plugged in via usb, there is no pattern) I have to just hit the camera button to reboot and then usually it boots up fine. It's just weird that this seems to happen for no reason. Any ideas how to make it stop?