Just got this battery for a friend, it looks like the LiPO construction, but it's hard and everywhere it says it's an Li ION, so what is it? : r/AskElectronics
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a.k.a brainstorm on Twitter: "Discarded vaping devices come with free rechargeable Li-Ion batteries with varying capacities. Those can be safely charged with a single cell TP-4056 charger (with battery protection ICs) and