You can salvage lithium 18650 cells from all sorts of modern ... Or if you’re a bit more adventurous, you can build this “Battery Health Monitor” designed by [DIY GUY Chris].

Draining a battery is easy. Just put a load across the ... a holder for a single 18650 cell, and a rocker switch to connect it all together. But wait, what’s that a TP4056 charging module ...

The U.S. Consumer Product Safety Commission warned consumers against purchasing 18650 batteries — which are often used to power vapes and other small devices — due to the risks associated ...

Overheating batteries are a serious risk, in the worst cases leading to fires and explosion. A team including researchers ...