I occasionally received -210 once the battery is fully charged. I never knew why. I posted about it awhile ago here: Device Vital reports "Err:-210", "state:unknown" when plugged into USB? Is this normal? - #4 by jgskarda
It would be nice to know what the -210 really is and if it could report accurately. As of now, I have no good way to tell the difference between battery disconnected vs battery fully charged. Never really knew why. As for your scenario. I’m really not sure.