I find that rockbox will not shut off my h320 until battery voltage is below 3V,but  most PDAs use llithium cell  shut off when voltage is below 3.5v or 3.6v。is it harmful to discharge battery to 3V ?how can I set auto shut-off voltage  to 3.5V in rockbox?
and,when I charge h320 in bootloadr USB mode,backlight is always on,how can I turn it off ?