Well, here's the problem. Once, the "low power mode" is entered on iOS - it remains on that mode until your battery is charged more than 80%.

Easy enough to turn it off if you need to before getting back to 80%, though in my experience that scenario rarely comes up. (I do, on the other hand, often find myself turning it on before my battery is low enough to automatically suggest it to me, when thinking ahead about how long until I'd be able to charge.)

That was the point. There might be some false positives for uber here.

Sure, but anecdotalmoly I'd guess 95% of my false positives are caused by my being cautious early, not by recharging without hitting 80%