You can salvage lithium 18650 cells ... In this case [DIY GUY Chris] has gone with the ATmega328P, with a pair of addressable WS2812B LED bars to show the battery’s health and charge levels.

You can salvage lithium 18650 cells from all sorts of modern gadgets, from disposable vapes to cordless power tools. The ...

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