eli5 why battery capacity is measured in mAh in phones but Wh normally?
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mAh is milliamp hours, a measure of current over time. The ampere (amp) is the basic unit used to measure electric current. A milliamp is one one thousandth of an amp. Cell phones (as far as I know) all use the same 3.7 volt lithium battery technology. Only the amps are different, not the volts.
Wh is watt hours, a measure of power over time. Power is amps times volts. So when you’re comparing things with different voltages, you need to use watts. Comparing just amps is not enough if the voltages are different.
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