OnePlus is projected to launch second-gen versions of its more affordable Buds Z TWS earbuds soon. A new leak for these accessories hint at a considerable boost in total battery life, slated to reach up to 18 more hours between charges. However, this only applies when the Buds Z2s' new noise-cancelling feature is turned off.
https://www.notebookcheck.net/OnePlus-Buds-Z2-a-full-specs-leak-points-to-some-crucial-upgrades-in-the-OEM-s-next-upcoming-TWS-earbuds.568934.0.html