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What if the battery used in these planes are like my phone batteries.

After using my phone for a few hours, the remaining battery will be down to 25%. And in 5 mins, my phone will be off due to the dead battery.

Once it happened to my EV. The battery was down to 50%, and then suddenly drop to 10%. Luckily, I was very close to my home.

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that’s because for those cases the power draw is hard to predict. in case of your phone, the BMS might be lying and also the state of health of the cell might not be accounted for, but it’s more likely that some apps are juat power hungry. as for the EV, it’s doing the same thing as an ICE car, it predicts the range based on your last x kilometers, if you step on the throttle your range will deteriorate as you reach higher speeds and drag increases. a traditional car will start reducing the estimated range as well. I imagine that the aviation industry is much better at predicting and controlling the power draw, therefore the range won’t be so unpredictable. it’s not the cells that are unpredictable, it’s their end user.

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