how does a device battery charge & die?
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Battery is made of cleverly arranged material that can react in 2 different directions: on their own and produce electricity, or in the other direction given electricity.
For example, water is hydrogren (H) and oxygen (O). If you burn H & O you gets energy (in the form of heat). If you run electrical current through water, it separates back to H and O.
The burning step in my example = battery usage.
The “running current to separate back to H & O” = the charging step.
Obviously we don’t have water battery because the usage step produces heat instead of electricity, so we choose material that release electricity instead, such as Lithium mixture. This is why those batteries are called Lithium Ion.
Material wears and tears. That’s why battery die eventually.
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