What is it about electricity which causes this? Why can’t a device draw full power until the battery is dead?
In: Physics
The battery is like a water reservoir. You let the water flow out to do work for you. For example, the waterstream could drive a turbine and that rotation can go via a drive-shaft to the wheels of your electric car.
Turning that turbine needs a minimum of flow. If the flow isn’t enough or powerful enough, then the turbine stands still or is turned with low power only.
So before your battery runs out you are seeing this diminished flow struggling to power your device. And then it is not enough flow to do anything, and you declare the battery empty.
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