Insufficient of electricity has been a nightmare for all the smartphone users, which resulted in the so called “drainage bag” — power bank. Foreign firms invented the disposable power bank that has a heat resisting paper cover, and it has 2 hours, 4 hours, 6 hours in terms of users' need.

The fact is that it can't be used again, and the written time is only for reference. The power consumes differently by handset and users' habit.

Though it is taking power bank to a new degree, there is no doubt the environment friendly issue concerning this product is rising at the same time.