Measure your (dis)charging
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I found this interesting app called "Ampere" for Android, and found there are similar apps for IOS too.
https://www.androidpolice.com/measure-understand-smartphone-charging-speed
Although it is estimating I think it is a nice tool to see how quickly your phone battery is draining under different circumstances. For example you can see difference in discharge between MRA and GMaps, or with a 75% brightness or 50% brightness. Also you can see how quickly it is charging. See the difference between the plethora of charging protocols, see the uggly difference with wireless charging, and you might conclude that you are in for a new charger
