UPS not starting after shutdown condition

[alejandroed]

Hi!

I've very strange behaviour, if running on battery and one cell downs 3300mV the ups sends a graceful shutdown to the motherboard but it shutdown the nuc-ups itself too. After recovery the VIN the nuc-ups is powered off and it doesnt charge (because is off) the only way to start it again is connecting a external powered usb 5v to the micro-usb port, S1 & P9 does nothing.

I tried to change config1b3 and config1b4 but this parameters are useless if the ups is off.

I can't find anything in the parameters to change that behaviour. Anyone knows how to start de nuc-ups without connecting a powered 5v cable to it?