2 for 1 deal looks ok for a large battery. Only issue is that Max output is 15.5w. Model number CY3843PBCHE.
Local 2 years warranty, power bank 30000mha = 0.111kwh Power, USB-C in/out x 1 , 3.1Ax5V = 15.5W USB-C out x 1 , 3.1Ax5V = 15.5W USB-A out x 2 , 3.1Ax5V = 15.5W Total output 15.5w MAX