The Best Power Banks For SmartPhones: Top Reviews & Buying Advice

The Best Power Banks For SmartPhones: Top Reviews & Buying Advice

In our daily lives, the short battery life of our smartphones has always been a serious concern as the phones batteries need more power to survive a busy day. Fortunately, we are blessed with a breakthrough portable battery technology “Power Banks” that keep our gadgets alive and make our smartphones batteries last a week while we’re away from a power outlet.

Power banks are the fast-charging portable batteries that use a dedicated Mini or Micro-USB input socket to receive power from a wall socket adapter and a full-sized USB socket for discharging the power to our devices when we”re on the move. A single unity of power bank has input port, charging circuit, battery, discharging circuit, output port and indicators.

power bank block diagram

The input port serves as a connected point which charge the power bank for energy storage using its charging circuit. Also, it regulates the voltage and current supplied to the battery, which is primary energy storage element and required to charge up our mobile phone. The discharging circuit functions very similar to the charging circuit and safety cut-off the power flow to prevent overcharging and overheating. Output port connects power bank with smartphones and indicators help in visual monitoring.

Available in various sizes and shapes, these devices work on rechargeable lithium battery fitted inside them in a protective casing, which is guided by a printed circuit board (PCB) to control power flow and allow our device to access stored electrical energy using built-in batteries through a USB port.  Technically, the rechargeable battery is based on lithium technology which is further categorized as :-

  • Lithium-ion: Lithium-Ion batteries are popular for their higher energy density as they are designed to store more electrical charge in a given size or volume. These power bank batteries are quite cheaper to manufacture and often, they’re prone to ageing issues.
  • Lithium-polymer : In Lithium-polymer power banks, you are safe from ageing to the same extent, but they’re comparatively expensive and may not suit all budgets.
Image Credit: Instructables.com