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A 5,000mAh power bank typically consists of a lithium-ion battery, voltage regulation circuitry, input/output ports, and control circuitry. The lithium-ion battery provides a high energy density, making it suitable for compact devices. The voltage regulation circuitry maintains a stable output voltage as devices charge.Input ports are designed for recharging the power bank, often using a micro USB . Output ports, usually USB Type-A, deliver power to connected devices. Some power banks support fast-charging standards like Qualcomm Quick Charge or Power Delivery.Control circuitry manages the charging process, protecting against overcharging, over-discharging, and short circuits. LED indicators may display the remaining battery capacity. The power bank's casing is typically made of materials like plastic or aluminum, balancing durability and weight.