Lenovo Legion Go 65W 12800 Power Bank, Portable Power for Handheld Gaming and Other Devices, USB-C Integrated Cable, Magnetic Attach, Built-in Stand, Black

This is my power bank. Gives me 50% charge on the ROG and about near 2 full charges on the phone. And very thin it fits in the ROG case https://www.amazon.com/Lenovo-Portable-Handheld-Integrated-Magnetic/dp/B0FXMXW529