

I will carry around a huge power bank before I buy a laptop with soldered RAM.
I carry a ~300 Wh power bank with my laptop.
https://www.amazon.com/dp/B0D62PMB3R
They also have a less-elaborate, smaller, lighter, less-expensive ~200 Wh model that’s probably more actually-practical:
https://www.amazon.com/Anker-Portable-Generator-Traveling-Emergencies/dp/B0D62P85ZR
Note that you can’t take anything over 100 Wh on a flight in the US. I also have a 100 Wh power bank that I keep around for flights.









https://en.wikipedia.org/wiki/Lunar_Lake
According to this, all Lunar Lake CPUs have 4 performance and 4 economy cores; none have a single core.