This is surely the world's largest power bank.
Geng seems to have used a large battery pack that resembles the ones seen in electric cars. The power bank measures 5.9x3.9ft in length and width and has a protective frame and includes around 60 ports. It supports 220V electric potential voltage through its output charging connectors. Interestingly, one can power major electrical items like TV, washing machines, and even charge electric scooters with the power bank.
For better ease of transport, Geng has attached wheels to the power bank. Interestingly, despite packing a large size, it doesn't look all that different from a standard power bank, except for the much bigger size. However, it isn't as portable as standard power banks considering the size but it solves the problem of power outages in homes. Besides the massive power bank, Geng's YouTube channel has videos of homemade security patrol mech, flying wings, a tissue paper heating machine, and much more.