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.

[1]: https://arstechnica.com/gadgets/2023/05/review-framework-lap...