Power banks are used for providing portable power to charge battery powered items like mobile phones and other similar items that have a USB interface: they can charge via USB, etc or wirelessly.
Power banks work by using sophisticated electronics to manage taking in charge from a charger, storing it in a battery and then charging other devices.
There are two main technologies that are used:
Lithium-ion: Lithium-ion offers a high power density, and does not exhibit what’s called the memory effect (when batteries become harder to charge over time). Lithium ion batteries are significantly lower in cost.
Lithium polymer: Lithium-polymer batteries are generally more robust and flexible, especially when it comes to the size and shape of their build and they tend to last longer. They are also lightweight, they have a low profile, and have a lower chance of suffering from electrolyte leakage.
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