Power Bank :

A power bank is a portable device used to store electrical energy and charge other electronic devices like smartphones, tablets, smartwatches, Bluetooth headphones, and more when a traditional power outlet is not available. It acts as a portable battery charger, making it an essential accessory for people on the go.

Key Features of Power Banks:

1. Battery Capacity (mAh):

   • Measured in milliampere-hours (mAh), it determines how much charge the power bank can store.

   • Common capacities include 5,000 mAh, 10,000 mAh, 20,000 mAh, and 30,000 mAh or more.

   • Higher capacity = more charging cycles or ability to charge larger devices.

2. Input & Output Ports:

   • Usually includes USB-A, USB-C, or Micro-USB ports.

   • Some advanced models support fast charging and dual/multi-port output.

3. Charging Speed:

   • Some support Quick Charge (QC) or Power Delivery (PD) technology for faster charging.

   • Output is measured in volts (V) and amps (A), e.g., 5V/2.1A.

4. Design & Portability:

   • Compact, lightweight, and easy to carry in a pocket or bag.

   • Some feature LED indicators, digital displays, or built-in cables.

5. Safety Features:

   • Overcharge protection

   • Short circuit protection

   • Temperature control

   • Auto shut-off after full charge

Common Uses:

• Charging phones while traveling, commuting, or during emergencies

• Powering USB gadgets (e.g., fans, lights, speakers)

• Essential during power outages

• Useful for students, professionals, travelers, and outdoor enthusiasts

Popular Power Bank Brands:

Mi (Xiaomi), Realme, Samsung, Anker, Ambrane, boAt, OnePlus, and FINGERS.

Advantages:

• Portable and reliable backup power source

• Compatible with multiple devices

• Helps stay connected anytime, anywhere

• Available in various capacities and price ranges