Power Bank

A power bank is a portable, rechargeable battery that stores electrical energy to charge electronic devices like smartphones, tablets, and laptops without requiring a wall outlet.It typically contains lithium-ion or lithium-polymer cells and uses internal circuitry to regulate voltage and current, ensuring safe and efficient power transfer via USB-A, USB-C, or wireless charging ports

Key features include varying capacities (measured in mAh or Wh) that determine how many times a device can be charged, and fast-charging protocols like USB Power Delivery (PD) that reduce charging times. Modern units often include multiple output ports for simultaneous charging, built-in safety protections against overheating or short circuits, and indicators to monitor remaining power. They are essential for maintaining connectivity during travel, outdoor activities, or power outages.