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Intel NUC

CMOS battery failure

Battery: KTS 602L CR2032W 3.0V

Battery with connector cable CE-V

Power ON after AC loss fail

Even if is set to After Power Failure: Power On NUC doesn't start. Solution is to replace dead battery.

https://superuser.com/questions/1750218/intel-nuc-nuc6i5syb-power-on-after-ac-power-is-restored-is-not-reliable