They say that a good quality powerbank is much heavier than its cheap counterpart, because includes batteries and accumulators of a better quality and in a bigger number. Only thanks to this you can get true 10 000 mAh.
They say, the heavier it is the better it is. Well... not!
If you want a truly good quality powerbank then simply test it. Check, if:
- It looses all its charge during just a single month (must last at least a year since charging)
- It has problem charging just a half sized battery and looses all the charge trying to do so
If any of above is true, you don't even have to open it up to expect some piece of clay or otherwise creative solution inside.