An optocoupler tester is a small device that helps verify whether an optocoupler is functioning properly or has failed. In labs and repair work, optocouplers often fail without clear signs. They may ...

The Arduino is a great way for hobbyists and pros alike to experiment with programmable objects, but it can be confusing for beginners without these tools.

Battery life hasn’t exactly been a strong point for foldables so far, but that might be starting to shift. A recent comparison test gives a clearer idea of where things stand right now. The test comes ...

Finnish startup Donut Lab has just released the third independent test of its solid-state ...

The Finnish startup’s pack can charge from 0 to 80 percent in under 5 minutes, according to its first independent test. The Finnish startup’s pack can charge from 0 to 80 percent in under 5 minutes, ...

We tested 10 portable power stations in our lab - these two models were the most efficient ...

Donut Lab’s fast-charge demo beat many e-motorcycles, but 400 Wh/kg and 100,000-cycle claims remain unverified after the fourth test.

iPhone 17 Battery Test: Real-World Results Challenge Apple’s Big Claims Your email has been sent When Apple unveiled the iPhone 17 lineup, it talked up major battery gains. But a side-by-side test ...

YouTuber ScruffedBits has built what is effectively a homegrown UPS made from dozens of AA batteries. Some were rechargeable, but most were cheap disposables, and they were able to get a full-size ...

Check out the latest stories, videos, and podcasts from the week of Mar. 9, 2026. Andy’s back from the 2026 Analog Aficionados meetup, held at DesignCon this year, and pieces together some history of ...

OPPO Find N6 leads a foldable battery test; its 6,000mAh pack and Snapdragon 8 Elite Gen 5 last longest overall.

A 27-year-old engineer has powered an electric car using a homemade battery pack built out of discarded vapes.