mAh is not a good unit for power capacity because it depends on the voltage that is drawn. To compare battery capacities, it is best to always use the watt-hours (Wh) that are also given. These are comparable 1:1 between different models. In the case of the Ecoflow batteries, the mAh figure is obviously based on a voltage of 28.8 V, so the result is correct. If you calculate the mAh with a voltage of 5 V (USB connection), the result is 115000 mAh.