Framework started selling larger batteries in 2023 (61 Whr vs the base 55 Whr), and from looking through older reviews it looks like battery life significantly improved (>25% better) with the 13th-gen Intel upgrade [1]. I've got their 13-inch AMD 7840U but can't speak to the battery life as it mostly sits docked.
Have the bigger battery, battery life is still bad.
It's just a bad laptop: has "hot bag" syndrome, speakers are terrible even with the upgraded kit, the hinge that turns the screen off is very temperamental.
Still no open BIOS, they've hired a “Linux guy” who is super condescending in their official forums and locks topics when he feels the heat.
[1]: https://arstechnica.com/gadgets/2023/05/review-framework-lap...