On average, a 10,000mAh power bank takes around 5-6 hours to charge with a 2A charger, while a 20,000mAh power bank may take 10 hours. Larger capacities like 30,000mAh can take 15 hours or more. Smaller batteries, like 3,000mAh, may take 1.5-2 hours. Wh = (mAh / 1000) * Voltage Using the above example, the calculation would be: Wh = (10,000mAh / 1000) * 3.7V = 37Wh It's important to note that Wh represents the total capacity of the power bank, regardless of the number of devices it can charge or the number of times it can fully charge a specific device. WCUR.

how many hours power bank charging