I got so used to having the PlayBook now being able to charged when it is powered off that this even came to mind. But Ive tried it a few times already, Dev Alphas CANNOT be charged while it is still off so if you want to charge it. keep it on! Just an FYI . Also the time seems to be off as well, i have to reset mine almost everytime (it might be cause mine doesnt have a sim/doesn sync with network but ... its really off)
Yeah, it does seem to not last long on battery. It also seems to charge better when on. But since it is meant to be plugged in to a computer most of the time, I think it is okay. It wasn't meant to be a daily driver.