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

But own-brand batteries, such as those from Amazon and Ikea, are often cheaper and can produce some surprising results. Dates tested: June 2023, June 2022, July 2020, December 2019, May 2019, June ...

[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 ...

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 ...

With this battery combo you’ll get four HiQuick AA batteries and four AAA batteries, as well as a wall charger that’s capable of charging both sizes. The charger has fast-charging capabilities ...