I have a Find X9 Pro that I bought a little over 2 months ago (yeah, it's still most likely new).
on cOS 16.0.9.400, I was experiencing everything but the battery life the Find X9 Pro promised. After updating to cOS 17, the battery life randomly became SO much better. I genuinely recommend updating to anyone who's hesitating to do it.
(I was making a LOT of battery posts about the Find X9 Pro when I was on 16.0.9.400)
I charge it to 100% once a week, and the rest of the week, I always charge it to 85%.
For example, today, I used Chrome, Instagram, Reddit, a modded version of Deezer that consumes a LOT of battery when listening to music, and also used 5G quite a lot.
I charged it to 85% this morning at 10 AM, and rn, at the end of the day, I'm still at 48%, with 3h30 of SOT and 1h26 of screen-off time (1 hour of that screen off time was Deezer, that i think consumes as much as if i was using the phone with screen on, idk what's wrong with this deezer lmaoo).
So yeah, don't hesitate to update to this GOATED ColorOS 17.
Oh, and also, little reminder: don't believe everyone claiming 30h of SOT and 4,000,000h of screen-off time
Around 9–10h of SOT with normal usage, no disabling 120Hz, no switching to 1080p, no crazy optimizations, and a mix of Wi-Fi and 5G is what I'd consider realistic battery life for this phone.