ok, I've had rockbox for a few weeks now, and when I first got it, it was fine. Now, when I turn it on, it sometimes shows a battery with a small circle with a slash through it, then shuts down, not being able to turn on unless it's plugged into a computer for a while. Now, charging is a good solution, but it's still annoying, especially during long car/bus rides, and hours of free time after exams. Basically, what I'm asking here is why it does that, and is there a way to fix it if a computer isn't available?