After assembly the laptop will run from battery alone but will not boot from battery without mains being attached first, even if only briefly. ie. i can attach the laptop to AC and then diconnect and as long as i try to boot immediately it will start, otherwise it refuses to boot. When the laptop has to boot with the AC attached, it also has a longer boot time as if it is doing a memory test etc as it did when i first booted the laptop after build.
Has anyone else had this symptom? or has anyone have any idea of what i should look for?
Any input would be greatly appreciated