[help] Mi Powerbank 20,000mah V2 Problem

Jan 18, 2017
Hi, can anyone help me. my mi powerbank is acting very strangely.. i notice that when i charge it it alway blink from 1-2 dots.. then later it blinks all 4 led dots... when i unplug it.. it only charge 2 led lights... i already tried charge it full 12hours but still same.. when i charge my device it only charge 1-2 full charge of mi5prime... i feel so unsatisfied about it, its only 3-4months old... pls help