I assume 2:30 refers to SoT, not the entirety of its run, from 100% to 0%? if it's the latter, you got a shit battery. if it's the former, as someone mentioned, all 8xx SDMs have shit battery autonomy, even for undemanding tasks and doubly so if you're e.g. running something like LineageOS and no Google crap, so every app has to do its own cloud sync.
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No, the 2:30 does refer to the time it runs on battery
that sucks. yeah, that's a crap battery. get one from aliexpress or wherever and replace it (youtube's got tutorials for every model) or run it with a constantly connected battery bank.
the processor it uses, the Snapdragon 8 Gen 1, is pretty notorious for poor efficiency. I have a phone with it and it heats up a lot (battery reports 45C) from more demanding tasks (such as gps), battery life isn't the best either.
That said, my battery life has not been as bad as yours... 2:30hrs seems quite poor.
I agree - I've heard from others that the Snapdragon 8 G1 is quite power hungry and not very power efficient, especially for a SoC that was hyped by Qualcomm when it came out.
The battery life on my Find X5 Pro I believe to be linked to age. My dad owned this phone before I did so it had about a year or 2 of use which could have degraded the battery over time.