Thepower store in a power bank is equal to the multiple of its terminal voltage with its mAh [or Ah] rating. Since the terminal voltage of both 20,000mAh and 10,000mAh power banks are the same, that is 3.7 Volt. A 20,000 mAh power bank stores 2 times more power than a 10,000 mAh battery. Theaverage is 8000mAh, which also goes for laptops. A 20,000mAh power bank actually has a 13,300mAh capacity, which allows you to charge your tablets and Asa result, a 20000mAh power bank can provide numerous full charges for smartwatches and fitness trackers. Portable Speakers: The charging capacity of portable speakers can vary, but most have batteries between 1000mAh and 5000mAh. With a 20000mAh power bank, you can expect several full charges for portable speakers. Mostpower banks nowadays have input current in the range of 1-2 Amps. As a rough estimate, it can take around 4-6 hours to fully charge a 10,000mAh power bank with a standard 1-2 Amps charger. However, fast charging technology is becoming more prevalent in power banks, which can significantly reduce the charging time. Electrical mAh Battery Life Calculator is an online tool used in electrical engineering to precisely calculate battery life. Generally, battery life is calculated based on the current rating in milli Ampere per Hour and it is abbreviated as mAh. Ampere is an electrical unit used to measure the current flow towards the load. Powercapacity and battery capacity is measured in milliamp hours, or mAh. This measurement gives you a good idea of how many times your power bank can charge your phone. JB has multiple: 5000mAh power banks; 20000mAh+ power banks ; 10000mAh power banks; 2500mAh power banks; As well as a large range of both USB-C and Inbatteries, mAh is a measure of battery capacity, and it utilizes all three concepts (electric charge, current, and time) to estimate how much electricity the battery can hold. For example, a capacity rating of 1,000mAh on a battery means that once fully charged, it can sustain an electric flow of 1,000mA for one hour. Whilepurchasing one, ensure the capacity of the power bank is at least three times that of your smartphone device. If you are a heavy-duty user, buy power banks with mAh as high as 10000mAh. A great example is Anker Prime 20,000mAh Power Bank . OcKWcF.