Which power bank should I get or buy?What is a cheap, good, small, and fast-charging power bank?ScienceTech by admin - April 29, 2021August 28, 20210 What is a Power Bank?A power bank is a device or device from which we can charge our mobile travel or emergency time. When we do not have the facility of charging. There is a battery in the power bank, like the phone but, the capacity of battery is very high so that it can charge our phone 3 to 4 times. And as technology is getting advanced, the capacity of power banks is also increasing and nowadays wireless powder banks are coming into the market.Power Bank Working PrincipleMany people think that there is just one battery in the power bank, and the battery is just charged, and then the same battery charges our phone. But this does not happen.