20000mAh

20000mAh refers to a specific capacity measurement for batteries, particularly common in portable power banks and some laptop batteries. The unit "mAh" stands for milliampere-hour, which is a unit of electric charge. It quantifies how much current a battery can deliver over a period of time. In essence, a 20000mAh battery can theoretically supply 20000 milliamperes (mA) for one hour, or 2000mA for ten hours, or 200mA for 100 hours, and so on.

The 20000mAh capacity is considered a high capacity for portable power banks. This allows them to charge multiple devices multiple times or to fully recharge a large smartphone or tablet several times before needing to be recharged themselves. The actual number of charges a 20000mAh power bank can provide for a specific device depends on the device's battery capacity and the efficiency of the power bank and charging cable.

When considering a 20000mAh battery, it's important to note that the stated capacity is often a nominal value. Real-world performance can be affected by factors such as temperature, the age of the battery, and the efficiency of the charging circuitry. Higher capacity batteries generally mean a larger and heavier product, which is a trade-off for extended power availability.