What is a power bank?

A power bank is a portable device used to charge electronic devices like smartphones, tablets, and laptops when a wall outlet isn't available. They are essentially rechargeable batteries housed in a protective casing.

• Functionality: Power banks store electrical energy and discharge it through a USB port (or other port types) to charge other devices. The charging process involves transferring energy from the power bank's battery to the connected device's battery.
• Capacity: The capacity of a power bank is measured in milliampere-hours (mAh). A higher mAh rating generally means the power bank can charge a device more times or charge larger devices more effectively. For example, a 10000 mAh power bank can typically fully charge a smartphone two to three times.
• Input and Output: Power banks have an input port (usually micro-USB, USB-C, or Lightning) used to recharge the power bank itself. They also have output ports (usually USB-A, USB-C) to connect to devices for charging. Input%20and%20Output voltage and current ratings (measured in volts and amperes, respectively) determine the speed and compatibility of charging.
• Charging Speed: Charging speed depends on the power bank's output amperage and the device's charging capabilities. Some power banks support fast%20charging technologies like Quick Charge (QC) or Power Delivery (PD), allowing for faster charging times for compatible devices.
• Portability: Power banks come in various sizes and shapes, designed for portability. Smaller power banks are more pocket-friendly, while larger ones offer higher capacity but can be bulkier. Portability is a crucial factor when choosing a power bank.
• Safety Features: Reputable power banks incorporate safety features such as overcharge protection, over-discharge protection, short-circuit protection, and temperature control to prevent damage to both the power bank and the connected devices. Safety%20Features are essential for safe and reliable operation.
• Types of Batteries: Most power banks use lithium-ion (Li-ion) or lithium-polymer (Li-Po) batteries. Li-ion%20batteries are commonly used and relatively inexpensive, while Li-Po batteries are lighter and more flexible in terms of shape and size.