My household have used many cheap powerbanks from different brands. Pineng, yoobao, xiaomi, and many other unknown brands. Half of it got as freebies from event booth. Usually 1-2 years only tahan, then get bloated d.

If the powr bank easily spin around on a flat surface, that means it starting to bloat. If the powerbank looks bloated, I ask my family to throw it or give it to me to send at recycle center.