eli5; how do (built in) rechargeable batteries in a toothbrush or shaver last for ten years, but AA batteries die after 2 years of use?

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I don’t leave my shaver on charge, but my toothbrush is always in the charging holder, so it can’t be a difference cycled charging. I have a 20 year old toothbrush which I use for polishing jewellery, stick it on charge and it’s good to go.

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3 Answers

Anonymous 0 Comments

Good answers already. Also: purpose. One is built into a thing that is known to stand in a charger for long times. The other is very multi purpose and has to meet very different requirements. So it is a heck of a lot easier to make sure the specialized one doesn’t lose charge, when the other has to have a lot more possibilities…

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