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Best Alkaline Batteries for Your Devices in 2025

cnet.com See Full Bio 2025-08-26 16:58:00

For this round of testing, we gathered four of the most popular battery brands and tested five battery categories, including AAA, AA, C, D and 9-volt. Our objective was to find out which battery manufacturer offered the best value for your money. To assess battery performance, we used our custom-built battery test rig and timed the longevity of each battery, paying attention to their voltage output over time, and compared the difference in price per unit. Battery performance and voltage drop M

Topics: batteries battery test volt voltage
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PicoEMP: low-cost Electromagnetic Fault Injection (EMFI) tool

news.ycombinator.com Unknown 2025-08-30 09:05:56

The PicoEMP is a low-cost Electromagnetic Fault Injection (EMFI) tool, designed specifically for self-study and hobbiest research. Under the safety shield it looks like this: You can see some details of the design in the Intro Video. Thanks / Contributors PicoEMP is a community-focused project, with major contributions from: Colin O'Flynn (original HW design, simple Python demo) stacksmashing (C firmware for full PIO feature-set) Lennert Wouters (C improvements, first real demo) @nilswier

Topics: chipshouter design high picoemp voltage
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Spanish blackout report: Power plants meant to stabilize voltage didn’t

arstechnica.com Unknown 2025-09-09 10:15:24

The blackout that took down the Iberian grid serving Spain and Portugal in April was the result of a number of smaller interacting problems, according to an investigation by the Spanish government. The report concludes that several steps meant to address a small instability made matters worse, eventually leading to a self-reinforcing cascade where high voltages caused power plants to drop off the grid, thereby increasing the voltage further. Critically, the report suggests that the Spanish grid

Topics: blackout grid oscillations report voltages
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