The factors like size, shape, weight, capacity, and brand should be considered while buying a power bank.
It generally takes around 1 to 2 hours to fully charge a power bank.
Generally, the lifespan of a power bank ranges from 3 to 4 years.
Having a higher mAh battery gives a long battery backup.
While choosing a power bank you should make sure that the output voltage of your power bank matches your device.