Default N7105 switches off when not connected via usb cable

My note 2 has finally got stuck in a bootloop (refer to my previous thread) and I think I may have fixed it because I saw life with the "Samsung" logo after flashing the Android Revolution rom but disconnected the power cable because it always boots into that annoying "recharge" mode which claims the battery is at 100%. When I did that, the phone just switched off (as it has done recently) and won't turn back on without constant power supply.. I've tried leaving it to charge but it claims 100% and just keeps switching off..

The phone was (before the power issue) in a soft-brick and I have been flashing stock roms via odin in an attempt to solve the brick but after that it has been needing constant power.. Is there any solution?