Pierre Freysinger is the most technical profile at Best Batteries, and probably the one who makes the rest of the site possible: he runs the infrastructure, the product database, the partner integrations and, above all, the user experience. Trained in computer science in Strasbourg and then in human-computer interaction, he wears the rare double hat of developer and interface designer. That sensibility runs through his whole way of testing: a product is worth not only its spec sheet, but what you feel while using it.
Where many stop at the numbers, Pierre hunts down what shows up in use and never on the box: a screen unreadable in bright sunlight, an inaccurate charge indicator, a poorly thought-out cable, an absurd companion app, a charging standard badly respected. Curious to his fingertips, he sometimes takes products apart to judge the quality of the solder joints and the presence of protection circuits. It is this eye that makes him credible on regulatory and connectivity topics, like his reference article on mandatory USB-C in the European Union.
His German, inherited from Alsatian roots, lets him follow the documentation and the manufacturers of Central Europe, a quiet but valuable asset for the team. On Au Frais, he applies the same demanding eye to the ergonomics of portable fridges, from the accuracy of the temperature display to how clear the control app really is.
Single and a self-confessed geek, Pierre devotes his evenings to home electronics projects based on Raspberry Pi and Arduino, when he is not escaping into a video game or a tabletop role-playing session. He even automated part of the warehouse lighting to optimize its consumption, a bit of tinkering perfectly in step with the company's eco-responsible approach. True to form, he often starts a test by switching off all of a device's useless beeps: for him, a good product must stay understandable once stripped of its gimmicks.
Magnetic wireless charging, a built-in cable, Qi2 at 25 W or just a backup trickle: we compared the best MagSafe and Qi2 power banks on the market to help you pick the right one.
Published on September 2, 2026 by Pierre
On its main port, the Anker Nano II 65W holds the advertised 65W, confirmed in real-world use on a Samsung smartphone during fast charging. Compact size and thermal management are its consistent strengths, but two real limits stand out: power that falls short for the most demanding laptops, and sharing between several devices that stays modest as soon as three of them are plugged in at once.
Published on August 30, 2026 by Pierre
During a power cut, the router is rarely the appliance anyone worries about, and that is exactly the problem: it gets plugged into whatever station is at hand, on whatever socket is closest, and half the possible runtime is lost without anyone noticing. A router barely draws any power. What matters here isn't the size of the station, it's how you plug it in.
Published on August 28, 2026 by Pierre
PD, PPS, Quick Charge: these acronyms look alike but are not quite the same thing. Here is how to make sense of them, so you can charge your devices at full speed, with the right charger and cable, without damaging anything.
Published on August 25, 2026 by Pierre
One wall plug for the laptop, the phone and the earbuds: that is what a multi-port GaN charger promises. The catch is knowing how much power actually reaches each port once everything is connected. Here are six models we rate, from 65 W to 250 W.
Published on August 22, 2026 by Pierre
Charging a laptop from a backpack as fast as from its wall adapter is now perfectly realistic. You just have to pick the right pack: here are five power banks that genuinely deliver 100 W and more over USB-C.
Published on August 12, 2026 by Pierre
Since late 2024, the European Union has required a single charging port on almost every portable electronic device: USB-C. No more drawer full of incompatible cables, at least for shoppers in Europe. The US has no equivalent mandate yet, but the logic behind the rule, and the buying advice it produces, holds up on either side of the Atlantic.
Published on July 11, 2026 by Pierre
Updated on July 29, 2026