It's back to the roots for OnePlus with the Nord: It should be a budget upper-class smartphone that makes high-end features affordable. We describe our first impression of the device here.
https://www.notebookcheck.net/OnePlus-Nord-Hands-on-and-unboxing-video-of-the-budget-flagship.482688.0.html
Xiaomi has 5G lite phone, which has 4150mAh battery, reviews been showing it does have goodlasting battery (despite it does have MIUI, very known for high battery usage), compared to Motorola Edge for example, which has bigger battery (4500mAh), still worse battery life.
Of course it is using 60hz, instead of Nord 90hz (but it can be changed to 60hz on Nord, to save battery)
OxygenOS is very good optimized for battery, and most blotware can be removed from eating battery background, so very likely atleast similar battery runtime as Xiaomi 5G lite phone, or even little better.
Thats lots of money 400-500 euro. All my savings.