A power bank, also known as a portable charger or external battery pack, is a portable device that stores electrical energy and can be used to recharge electronic devices such as smartphones, tablets, laptops, and other gadgets when they run out of battery power. Power banks typically contain lithium-ion batteries and come in various capacities, sizes, and shapes to suit different needs. Many people look for the best power bank or portable power banks when they need reliable on-the-go charging. They are convenient for charging devices on the go, especially when access to electrical outlets is limited.

The lifespan of a portable power bank can vary depending on factors such as its quality, frequency of use, and maintenance. Generally, high-quality power banks can last anywhere from 3 to 5 years, while lower-quality ones may only last 1 to 2 years. Proper usage and maintenance practices, such as avoiding overcharging and over-discharging, charging it regularly, and avoiding extreme temperatures, can help extend the lifespan of a power bank.

The capacity of your portable power bank depends on the devices you need to charge and their battery sizes. If you're charging just a smartphone, a power bank with 5000mAh to 10000mAh should suffice. However, if you're charging multiple devices or larger ones like tablets or laptops, you might need a power bank with 20000mAh or more.

Keep in mind that nominal capacity differs from actual usable capacity due to conversion efficiency. And for charging laptops, output power (30W, 65W, 100W) is more important than capacity—not every 20000mAh power bank can charge a laptop.