NEC's latest 13.3-inch ultrabooks weigh only 814 g with an L battery or 868 g with an LL battery. Even so, the bigger batteries are still able to last up to 24 h (15 h for the smaller ones), and both can be charged up to 80% in one hour. The ultrabooks can be powered by either an i5-10210U or an i7-10510U CP coupled with up to 16 GB of LPDDR3 RAM and up to 512 GB NVMe SSD storage.
https://www.notebookcheck.net/NEC-launches-13-3-inch-VersaPro-J-UltraLite-type-VG-ultrabooks-with-Comet-Lake-U-CPUs-under-900-grams.488993.0.html