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A comment on Everything with a battery should have an off switch. Parent comment

Re:Everything with a battery should have an off switch by _carbyau_ on Tuesday May 10, 2022 @01:59AM (#31323948)
The same little charger circuit built into the batteries also converts the lithium battery chemistry voltage to 1.5v making them a drop in replacement for AA and AA batteries.

Or are you saying you can get 1.5V lithium rechargables that work with an external charger?

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