X1 Carbon still has pretty terrible battery life compared to say an M-1 Mac. I used to be a thinkpad fan having had T450s personally and then a X1-Carbon/X1-Extreme for work. While the T450s experience was mostly good the latter experience convinced me to not get another thinkpad as my next laptop because:

1. The X-1 Carbon light as it was had terrible battery life of a few hours. 2. The X-1 Extreme fans are like jet engines and often on even when I'm not actively doing anything and my account is locked.

Got the cheapest base M-1 Mac and it is dead silent, has great battery life and amazing performance. Plus the price is killer too.