1.my one works fine with battery. but there are some problem with charger(it charges slowly), so i bought 5V/3A USB charger and USB to DC cable.
2.i tried several sd cards, it works fine. code 10 error is usually related to driver. please re-install driver.
3.no such a problem for me. it think it is related to hibernation.
4.also there is no such a problem for my ezpad.