Awei P6K Powerbank 20000mAh 2USB 2.1a Black
Maximum quantity is 5
For laptops and power banks, you should choose a power bank with at least a 20,000mAh capacity. Tablet batteries have a capacity between 6000mAh (iPad Mini) and 11,000mAh (iPad Pro). The average is 8000mAh, which also goes for laptops.