[Ray’s] breadboard power supply lets you drain the last traces of power from ‘dead’ AA batteries. Electronics that are powered off of disposable alkaline batteries have a cutoff voltage that ...

Is anyone giving or receiving a holiday gift labeled "batteries not included"? We thought so. Listen up: We tested 15 AA batteries—the type typically used in digital cameras, flashlights ...

With NiMH AA batteries, you have to top them off before use because they lose much of their charge sitting around. And that can be a nuisance. But in the last year, several companies have designed ...

Max K is using a Raspberry Pi RP2040 to power his custom automated battery charger that doubles as a beautiful desk clock.