XTAR VC2 vs Nitecore UM20 (or other options)

Well, my VC2 display just blinked (OFF/ON/OFF…) a few times the first time i used it, but i couldn’t tell WHY!

Surely it does NOT blink continually when a battery of fully charged, that i know because i already charged 2 batteries. The only indicator that blinks is the FULL label on the display (and NOT the display itself)