I have a Photon applications with a CR2032 battery attached to VBAT. When powering the whole thing down while still having the backup battery attached to VBAT, I observe that the status LED is glowing RED at a very low level: you can hardly see but its there and it vanishes as soon as I remove the backupbattery as well.
I know that in one of my earlier experiments with this particular device (an application without a backup battery, btw) I blew up the D0 GPIO as a result of some clumsiness. However the other inputs and outputs seemed to act correctly. So this device seems to work rather normal; the only noticeable thing is the RED glowing when the CR2032 is attached, which still makes me doubt as to whether I should I should use this device or simply throw it away.
Has anybody any advice?