What is Power Bank:

Power banks can be defined as compact batteries that use circuitry to control any power in & power out. They can charge up easily by using a ‘USB’ charger when power is available. The name power bank is an inspired name that can be likened to a financial bank where funds are deposited or stored & withdrawn whenever needed. Power banks, they store a specific amount of electrical charge inside through normal charger from an electrical socket. The cells of the power bank keep the charge save for a longer time.  Later on, this electrical charge can be used to charge different mobile devices through normal ‘USB’ cable. This is how all power bank works.

Types of Power bank:

  • Standard power bank: These compact chargers are easily available in the stores & online. They can be charged from the normal ordinary (USB) sources like (USB) chargers. These are also called as universal power banks.
  • Solar power bank: As the name indicates, these solar power banks can also use sunlight to charge up. They are made up of special photovoltaic panels which store charge. Such power banks are really reliable because they don’t need an electrical outlet to charge. You can carry them anywhere you want and can charge easily in the sunlight without any problem within a few minutes.

Power bank lifetime

There are 2 main forms of a lifetime that are associated with power banks.

  • Charge & discharge cycles: Lifetime of the battery is measured in terms of the number of charge-discharge cycles it can undergo before its performance falls by a given degree. Some less expensive power banks may only have a life of 500 or so charge-discharge cycles, but on the other hand, better ones will have lifetimes of many more charge-discharge cycles.
  • Self-discharge time period: Cells of all batteries, whether rechargeable or primary have a certain level of self-discharge. For rechargeable batteries nowadays with their own control circuitry, a small amount of power is required to keep these circuits alive. So, there is only a  finite time that a battery will remain charged.

A good & quality power bank can hold the charge for up to 6 months with only a small loss of charge, but the lower quality may only retain a useful charge for about a month. These figures are for room temperature, but storing them outside these temperatures considerably minimizes their performance.

Power bank battery technology

Power banks use rechargeable batteries based on lithium-ion technology. Lithium-Ion & Lithium-Polymer batteries are commonly used for power banks these days but don’t get surprised if other types start to hit the market before long. The 2 technologies that are currently used have slightly different properties:

  • Lithium-ion battery: Number one is Lithium-ion batteries. Lithium-ion batteries have a really higher energy density, i.e. they can store more electrical charges in a given size or volume, & are cheaper to manufacture, but with the passage of time, they can have issues.
  • Lithium-polymer battery: Number two is Lithium-polymer. Lithium-polymer power banks face fewer problems & do not suffer from aging. However, they might be a little costly for the manufacturer.

Benefits of Using Power Banks

  • Power banks are very useful when you have a power cut at your home or no electricity area.
  • Power banks have the ability to charge things faster because these are high powered devices.
  • Power banks can be recharged easily by attaching to any ‘USB’ port.
  • Power banks are always giving freedom to use your phone without worrying about its battery.
  • Power banks make your travel comfortably without worrying about the battery.
  • Power banks are really easy to carry anywhere because some power banks are very light.
  • Power banks are reliable in times of need.
  • Power banks are cost-effective which can be used for multiple devices quite easily.
  • Some power banks have a flashlight too for emergency cases.
  • Solar power banks give a constant free top-up.
  • Power banks work great for all mobile devices.

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