Issues charging 2024 blade 16 using power bank

I bought two INIU B64(should support 100W PD charging and has 99.9Wh) power banks to charge my 2024 blade 16 on the go. I know it's not a laptop meant to have a lot of battery life but I thought I could get a few more hours using power banks. But every time I plug it in the power bank, it works for like 20 to 30 seconds and then goes "nah" and I get a message saying inadequate or insufficient charging or something. I have a 100W usb-c cable with E-Marker chip so I don't think that's the problem, I also tried other cables and I got the same problem. Is there something I can do? My blade 16 is supposed to support 100W PD charging through the usb-c port. Please help.