This DIY Wooden Battery Charger Brings Dead AAs Back to Life

Most homes accumulate a drawer full of dead AA and AAA batteries, and the uneasy feeling of tossing heavy little cylinders into recycling or the trash. Alkaline cells are marketed as single-use, even though the chemistry can often be coaxed back to life with the right kind of intervention. RegenBox 1 is a small, hands-on challenge to that throwaway logic, turning battery regeneration into a bench-top ritual that requires patience, measurement, and a soldering iron.

RegenBox 1 is a kit that arrives as a flat collection of components, a printed circuit board, electronic parts, and laser-cut wooden panels. Once assembled, it becomes a USB-powered regenerator for AA and AAA alkaline batteries, designed for electronics hobbyists rather than casual users. The wooden case and visible PCB make it feel more like a lab instrument or workshop project than a sealed plastic charger, and building it yourself is half the point.

Designer: Regenbox

Assembly requires a soldering iron and solder, a voltmeter, flat-nose pliers, wire cutters, and a small screwdriver, plus some electronics confidence. The kit supplies the PCB, resistors, diodes, LEDs, IC, battery holders, USB cable, and the wooden enclosure. You are not just buying a gadget, you are learning how it works as you put it together, turning the components into a functional regenerator that can sit on your desk or workbench for years.

Using it starts with testing each alkaline cell with a voltmeter. Below 0.9 V goes to recycling, 0.9 V to 1.35 V is a candidate for regeneration, and 1.35 V to 1.5 V is already reusable. Once cells are slotted in and the USB 5 V input is connected, the circuit feeds very low current for 8 to 24 hours, slowly reversing part of the discharge without stressing the casing or causing leaks.

The boundaries are strict, alkaline only, no lithium, no damaged or leaking cells, correct polarity, and room-temperature use. The red and orange LEDs indicate current flow and help with diagnostics, but the real discipline is in measuring voltages before and after, and respecting the chemistry. It is not a fast charger; it is a patient tool that trades speed for safety and extended second lives.

Getting one or more extra cycles out of batteries that would otherwise be discarded adds up across a household or community. The open, repairable design invites modification and learning, turning energy use into something you can see and tweak. RegenBox 1 becomes a quiet protest against sealed, opaque devices, and a small workshop ally for anyone trying to reduce waste while gaining control over the objects they depend on.

RegenBox 1 changes the way you look at dead alkalines. Instead of being the end of the story, they become candidates for triage, measurement, and careful regeneration. The wooden box on the bench is a reminder that design can intervene not just at the point of purchase, but at the moment we usually give up on an object, asking whether it really needs to be thrown away yet or if a slow, gentle charge might bring it back for another round.

The post This DIY Wooden Battery Charger Brings Dead AAs Back to Life first appeared on Yanko Design.

Build a Fast Offline AI Assistant on a Raspberry Pi 5

Build a Fast Offline AI Assistant on a Raspberry Pi 5

What if you could build an AI chatbot that’s not only blazing fast but also works entirely offline, no cloud, no internet, just pure local processing power? Below, Jdaie Lin breaks down how he achieved exactly that using a Raspberry Pi 5, the RLM AA50 accelerator card, and some clever optimization techniques. Imagine a compact […]

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The best cameras for 2026

Choosing a camera is not just about resolution or price. It is about finding something that matches how you like to shoot. Some photographers want a compact mirrorless camera that travels easily. Others want an action cam that can handle rough hikes, or a full-frame system that delivers the best possible image quality. With so many options today, there is a camera built for almost every creative style.

We tested the top models across categories to help you decide which one fits your needs. Whether you are filming your first vlog, shooting portraits or capturing fast-moving action, these are the best cameras to help you grow your skills.

Mirrorless is the largest camera category in terms of models available, so it’s the best way to go if you’re looking for something with the most advanced features. Canon and Nikon recently announced they’re discontinuing development of new DSLRs, simply because most of the advantages of that category are gone, as I detailed in a video. The biggest selling feature of a mirrorless camera is the ability to change lenses depending on the type of shooting you want to do.

The most important features to look for in an action cam are image quality, stabilization and battery life. GoPro has easily been beating all rivals recently in all those areas, but DJI has taken a lot of its business with the Osmo Pocket 3 gimbal camera.

This category has fewer cameras than it did even a few years ago and many models are older, as manufacturers focus instead on mirrorless models. However, I’m still a big believer in compact cameras. They’re a noticeable step up from smartphones quality-wise, and a lot of people will take a compact traveling or to events when they’d never bother with the hassle of a DSLR or mirrorless camera.

Compacts largely have type 1-inch sensors, but a few offer larger options, particularly Fujifilm’s XF-100V. Another popular model, Sony’s XV-1, is primarily aimed at content creators looking to step up. In any case, desirable qualities include image quality, a fast lens, relatively long zoom, flip-out display, good battery life, a high quality EVF, decent video and good pocketability.

Though smartphones get better for video and photos every year, full cameras still have an edge in many ways. The larger sensors in mirrorless cameras let more light in, and you have a wide choice of lenses with far superior optics. Dedicated cameras are also faster for shooting things like sports or wildlife, offer superior video for content creators and create more professional results.

There are a few key things to consider to get the most out of a camera. The first is sensor size: in general, the larger the sensor, the better (and usually more expensive) the camera.

Full frame is the largest sensor size for mainstream cameras, and it’s available on models like the new Panasonic S9, the Nikon Z III and Canon EOS R5 II. At a size equivalent to 35mm film (36 x 24mm), it offers the best performance in terms of image quality, low-light capability and depth of field. But it’s also very expensive and finicky. While bokeh looks incredible at an aperture of f/1.4, the depth of field is so razor thin that your subject's eyebrow might be in focus but not their eye. This can also make shooting video difficult.

The next size category is APS-C (around 23.5 x 15.6mm for most models and 22.2 x 14.8mm for Canon), offered on Fujifilm's X Series lineup, the Canon R10, the Sony ZV-E10 II and the Nikon Z50. It's cheaper than full frame, both for the camera body and lenses, but still brings most of the advantages like decent bokeh, high ISOs for low-light shooting and relatively high resolution. With a sensor size the same as movie cameras, it's ideal for shooting video, and it’s easier to hold focus than with full-frame cameras.

Micro Four Thirds (17.3 x 13mm), a format shared by Panasonic and Olympus, is the next step down in sensor size. It offers less bokeh and light-gathering capability than APS-C and full frame, but allows for smaller and lighter cameras and lenses. For video, you can still get reasonably tight depth of field with good prime lenses, but focus is easier to control.

The other common sensor size is Type 1 (1 inch), which is actually smaller than one inch at 12.7 x 9.5mm. That's used mostly by compact models like Sony’s ZV-1 vlogging camera. Finally, action cameras like the GoPro Hero 11 and DJI’s Osmo 3 have even smaller sensors (1/1.9 and 1/1.7 inches, respectively).

For photographers, another key factor is autofocus (AF) speed and accuracy. Most modern mirrorless cameras have hybrid phase-detect AF systems that allow for rapid focus and fast burst speeds. The majority also offer AI features like eye-detect AF for people and animals, which locks in on the subject’s eyes, face or body to keep them in focus. However, some models are faster and more reactive than others.

The electronic viewfinder (EVF) and rear display are also crucial. The best models have the sharpest and brightest EVFs that help you judge a shot before taking it. For things like street photography, it’s best to have as bright and sharp a rear display as possible, so it’s easy to see your subject and check focus in all manner of lighting conditions. You may also want a screen that flips out rather than just tilting, too.

DSLRs and mirrorless cameras let you change lenses, but you're stuck with what's built into a compact camera. While that's great for portability, a single lens means you're going to sacrifice something along the way. The Fujifilm X100V, for instance, has a fast but fixed 35mm-equivalent f/2.0 lens and no zoom. The Sony RX100 V has a 24-70mm zoom, but it's slower at the telephoto end (f/2.8) and less sharp than a fixed focal (prime) lens.

When choosing a lens for a mirrorless camera, you’ll need to consider the focal or zoom length, along with the minimum aperture. Smaller numbers like f/1.4 for a prime lens or f/2.8 for a zoom are best, as they let you work in darker environments and maximize background blur to isolate your subject. However, those lenses are more complex and thus more expensive.

When it comes to video, there are other factors to consider. Some cameras combine or skip over pixels (line skipping or pixel binning) for video recording, which is not ideal because it can reduce sharpness. Better cameras tend to read out the entire sensor and then “downsample” to improve video sharpness (camera manufacturers don’t often say if video is pixel binned, but will say if it’s downsampled). Another important factor is sensor speed, as slower sensors tend to have more rolling shutter that can create a “jello” effect that skews video.

In addition, how’s the battery life? How do you like the handling and feel? How long can you shoot before the camera heats up or stops? Does it support 10-bit HDR video? Is there a microphone and/or a headphone jack? (If you record a lot of interviews, it's preferable to have both.) How's the video autofocus? All of these things play a part in your decision.

This article originally appeared on Engadget at https://www.engadget.com/cameras/best-cameras-151524327.html?src=rss

Is the 2026 Apple TV Worth the Wait?

Is the 2026 Apple TV Worth the Wait?

The Apple TV 2026 is set to redefine the landscape of home entertainment and smart home integration. Scheduled for release in spring 2026, this highly anticipated device combines advanced technology with user-focused functionality. Featuring the powerful A17 Pro chip and Apple Intelligence, it is designed to appeal to gamers, smart home enthusiasts, and entertainment lovers […]

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Inside NVIDIA’s $20B Groq Licensing Move, Speed Gains and Fewer Watts

Inside NVIDIA’s $20B Groq Licensing Move, Speed Gains and Fewer Watts

What happens when a tech giant like NVIDIA, already dominating the AI hardware space, makes a bold $20 billion move to license innovative technology from an ambitious startup? Matt Wolfe breaks down how NVIDIA’s licensing agreement with Groq, a deal that’s anything but conventional, could reshape the future of artificial intelligence hardware. This isn’t your […]

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Samsung Galaxy S26 Ultra: This is the One You’ve Been Waiting For

Samsung Galaxy S26 Ultra: This is the One You’ve Been Waiting For

The Samsung Galaxy S26 series is poised to reshape the premium smartphone market with a host of significant upgrades. From enhanced displays and faster charging to improved camera systems and advanced processors, the S26 lineup offers a compelling mix of innovation and practicality. With a February 2026 launch on the horizon, Samsung is positioning itself […]

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Learn Copilot Chat for MS Teams : From File Analysis to Loop Pages, Custom Styles & Agents

Learn Copilot Chat for MS Teams : From File Analysis to Loop Pages, Custom Styles & Agents

Have you ever wished for a smarter way to manage your workload in Microsoft Teams? With AI-powered features that draft emails, analyze data, generate visuals, and enhance collaboration, Copilot Chat is here to transform how you work, all within your virtual workspace. In the video below, Mike Tholfsen breaks down how this innovative assistant transforms […]

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This $89 Fountain Pen Shows You the Ink Flowing Through it’s 3D Printed Maze

Nib is the first thing I want right when choosing a fountain pen, then I look for its design and aesthetics afterwards. Endless Stationery, a Chennai, India-based global stationery brand, that successfully created a retractable fountain pen and raised close to $250,000 in funding for it in 2024, wants to change my idea in favor of aesthetics without compromising the writing experience.

The company has partnered with 3D printing experts Arclayer to design and launch Maze fountain pen, which makes “what used to be hidden… the star of the show.” The new series of fountain pens has a see-through body, allowing you to gawk at the flowing ink within the geometric patterns 3D printed inside the pen.

Click Here to Buy Now: $89 $99 (10% off). Hurry! Raised over $280,000 already.

Arclayer is redefining the writing instrument as we know it through these visually appealing 3D-printed fountain pens for Endless Stationery. The Maze pen created in partnership, answers the simple question, “why can’t a pen be beautiful on the outside and the inside,” which the makers asked themselves before getting down to creating a fountain pen built from “light, resin, and imagination.”

Within each Maze pen is a 3D printed architecture in the form of DNA, pattern or spiral, which allows the ink to flow through them, creating a visually exciting display unlike anything ever seen before in a pen. While Maze pens are standard, the Maze Pro features the Japanese eyedropper inking system that makes the pen easy to carry in movement-intensive journeys or even on airplanes; soring at high altitudes without worrying about the ink leaking at pressure changes.

For the design of these pens, the upper body and the grip section are made from acrylic, while the barrel is made by 3D printing resin. All the Maze pens are formed using resin printing, which makes it possible to have the ink chambers designed the way they are. 3D printing allows a clear finish and internal geometry without adding weight to the pen design. It comes in a special casing which doubles as a fidget toy, if that’s something you tend to spend extra on.

The pen interiors are lively and show the company’s own Alchemy Ink flow through the interesting architecture, yet the intriguing design is easy to clean. It can be rinsed with water to keep the ink flow smooth. The Maze pens come in five unique patterns, DNA, Morse, Twist, Coil, and Swirl and as many colors, with the choice to pick from extra-fine, fine, medium, broad, and a special architect nib.

Currently, the Maze and Maze Pro fountain pens are available for preorder through Kickstarter, where they are enjoying a successful crowdfunding campaign. You can preorder a Maze fountain pen starting $89, while the Maze Pro costs $10 extra. The campaign is also providing a celebratory Christmas combo, which you can get for $135 now. It includes a Maze Pro, a pen pouch, Alchemy Ink, and a set of Storyboard Pocket Notebook.

Click Here to Buy Now: $89 $99 (10% off). Hurry! Raised over $280,000 already.

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LG announces new line of xboom speakers ahead of CES

LG just revealed several new speakers in the xboom line ahead of CES 2026. These speakers are part of an ongoing collaboration with will.i.am from Black Eyed Peas, who is on board as the "experimental architect" involved with "development, design and brand marketing."

These speakers are fairly different from one another, but they all have AI in common. Each speaker includes an algorithm that automatically adjusts the EQ after analyzing the audio content and the listening space. Many also feature an AI algorithm for ambient lighting, which will adjust the lights to match the song being played.

The xboom Stage 501 is intended for parties and karaoke sessions. It features additional AI that can remove vocals from "virtually any song" and even adjust the pitch. The battery lasts for around 25 hours and can operate while plugged in. The speaker delivers up to 220W of power, with dual woofers and full-range drivers. It boasts a five-sided cabinet design that allows for vertical and horizontal placement.

A boombox.
LG

The xboom Blast is a boombox with a 99Wh battery that allows for up to 35 hours of continuous playback. That's a mighty fine metric. This is a modern boombox, so it's designed for durability. There are edge bumpers and a side rope handle for carrying.

A speaker
LG

The Mini is a tiny doodad that can be placed just about anywhere. It offers ten hours of battery life per charge and a strap for easy placement. The speaker also includes a built-in tripod mount.

A speaker.
LG

The Rock is a, well, rock-shaped speaker that's larger than the Mini but can still be held in the palm of the hand. The battery lasts for ten hours and the design is focused on durability. It has been tested to "seven military standards" to ensure reliability in "challenging outdoor environments." This is an upgrade of the pre-existing XG2 model.

We don't have pricing or exact availability on this stuff yet, though the speakers will be on display at LG's booth at CES. The company has said that all four of these gadgets will come out in 2026.

This article originally appeared on Engadget at https://www.engadget.com/audio/speakers/lg-announces-new-line-of-xboom-speakers-ahead-of-ces-010052598.html?src=rss