18650 lithium-ion cells, these type of batteries are very popular nowadays. And a good charger is very expensive. This is the most detailed tutorial on how to make your own cheap but very good - 18650 battery charger.

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TP4056 charging module: https://s.click.aliexpress.com/e/_DmO...
18650 holder box: https://s.click.aliexpress.com/e/_DnS...

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