Orashare Dare To Share

Hi, how can I charge my newly bought powerbank? Which is orashare 22.5w/20,000mAh , ang tagal nya kasi mag charge almost 3 hours na pero 23% pa lang sya, may preferred ba syang charger or what? Tinry ko na sya using extension and also direct outlet pero same response lang, tapos namamatay pa sya repeatedly? What can I do? Pls help