Why haven’t we managed to develop an easily-quantifiable unit for ‘how much energy something has left’ in rechargeable devices? For example “oh man, that phone call just cost me 5 Whatevers of phone battery”
In: Technology
What you are describing is a unit of energy: like Joules (J), Calories (cal) or Watt hours (Wh).
For electricity the Watt hours are the most common as they are easy to calculate using Volts and Amperes.
Some batteries comes with a Wh rating, but most small electronics use Ampere hours (Ah). They are equivalent for a given nominal voltage, so you can use them to compare batteries for similar devices, but not for say a car and a phone.
Most batteries come with an Ah rating written on the box. They are rarely used in advertising/consumer facing specs because they can’t be translated into hours of use: A phone with a 4Ah battery might last longer than one with a 6Ah battery.
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