Battery: KTS 602L CR2032W 3.0V
KTS 602L CR2032W 3.0V
Battery with connector cable CE-V
CE-V
Even if is set to After Power Failure: Power On NUC doesn't start. Solution is to replace dead battery.
After Power Failure: Power On
https://superuser.com/questions/1750218/intel-nuc-nuc6i5syb-power-on-after-ac-power-is-restored-is-not-reliable