Capacity is measured in milliampere hours (mAh). The higher the number of mAh the more charge the power bank holds for you to withdraw when you use it to charge your devices. The general rule of thumb is that smaller power banks have a typical capacity of 1,000 mAh and medium units have 3,000 to 5,000 mAh.
BOLD by UZE has a 27,000 mAh / 100Wh battery capacity in a portable and elegant aluminum body.
Once the power bank capacity is drained, it will need to be charged up again.