Dell PW7015L Powerbank Companion for XPS 15 9520 USB-C Laptop

I used to own a Dell XPS 15 9550, which required a barrel for charging, and I had two PW7015L barrel powerbanks that worked well with it. However, when I switched to a Dell XPS 15 9520, which uses USB-C for charging, I could no longer use the barrels powerbanks with it.

I discovered that by purchasing a Dell barrel to USB-C adapter, I could connect the old powerbanks to the XPS 9520. Unfortunately, the adapter was not available on Dell's website at the time, so I opted to buy a Dell PW7018LC powerbank for the XPS 9520 instead, as it uses USB-C.

Now, I'm contemplating if I buy the mentioned Dell barrel to USB-C adapter, would I be able to charge the older PW7015L barrel powerbanks using the XPS 9520 laptop charger. This is crucial because I usually travel with only one powerbank, the USB-C PW7018LC, but if the adapter allows me to bring along my two old powerbanks and charge them with the XPS 9520 charger, it would be a significant advantage.

Essentially, my goal is to avoid carrying the old barrel charger for the XPS 9550 and instead rely on the USB-C charger that comes with the XPS 9520. I want to streamline my charging setup and maximize the use of both old and new powerbanks without carrying additional equipment if possible.