Previous generation X1. Easily getting 6h of scripting. (As in, no heavy compiler or processing needed) Slightly warm, but no issues with heat.

Tbh that does not sound very good for a flagship model...

I've never seen a laptop actually survive longer than 7h practically. The advertised battery life may say >10, synthetic benchmarks may say a bit lower. But once you use it with wifi on, with proper brightness, actually doing some work - no - it always takes a big hit.

Did you try windows, or if linux with lightweight use, would it improve the battery life? I had a macbook pro for 4 years so battery degraded and the processor wasn't that efficient but anecdote for newer macbook rarely reports anything less than 6 hours. I'm interested in a X270 (for the battery) but then I read somewhere battery on linux is kinda unstable. What do you think?