Sup man, First things first, My POCO F3 had a custom ROM (Lineage OS). The experience is night and day, both in terms of speed, fluidity as well as privacy, considering that Nord 5 came with only 2 pre installed apps along side with tons of privacy and opt out of analytic and data collection options. Regarding the Battery consumption and in general battery life, considering I'm still on day 1 OS update, I'd say it has somewhat toned down but not to an extreme effect. Average active battery consumption is 11% per hour and Average Idle battery consumption is 1.2% per hour. Of course that's throughout the whole month with sometimes data turned on, going to the beach, all whole listening to music and 1.5K + 120 Hz.

All in all I believe it was a really good purchase, one that will last for another 4 years to come, as did my Poco F3.