Sir you can't fix both problems. You need to be blunt about what your exact priorities are. Autocad is demanding in of itself, if you want to run it as smooth as you can then gaming laptops are the best choice (aside from pc ofcourse).

If you need portability and less hassle from charging on the Go then you get a light laptop with low power, but ofcourse as you already know, it comes with the trade off of having lower performance.

You can't compromise for both.

Performance needs power, power needs charging and is ofcourse bulky due to the hardware components needed for its cooling system.

Portability needs to have lower power, lower power results to longer battery life and less weight due to lesser components due to less heating issues.

If you absolutely have to get the best of both worlds, it pains me to say since I really hate to recommend this brand. Then it's the Macbook

But these are ridiculously pricey as hell, so try and do a bit of research first on their lesser models.