Earlier quoted context omitted.
I've built a bunch of Lithium Ion packs (nothing huge, the largest was 10 KWh, but still you don't want to mess that up, that's 1000 cells in a 40S25P arrangement), none of them go that low under load. If your cells drop down to 2.0V under load that's not a normal condition, either you are discharging your cell at more than the 2C or so that is normally specc'd (which you are welcome to do but it will cost you in lif…
You'd be surprised the peak current demand of modern smartphones. AVERAGE current demand (not peak) of a Snapdragon 8 Gen 2 can hit 16W for short periods of time. At 3V, that's 5+ amps out of the battery. Worse if you account for efficiency, and even worse if you account for other power draws such as camera, display, etc etc. Running at 3-4C for short bursts is not out of the question.
But in for instance a vehicle or an e-bike you'd rarely see batteries drained faster than the spec, not if you want to use your expensive device for a while.