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.
A laptop isn't a smartphone: wattage, the USB-C PD standard and the right port matter far more than the mAh printed on the box. Here's how to choose without getting it wrong.
Published on October 19, 2026 by Pierre
With a single USB-C port and a total power budget of 35W, the Xtorm GaN2 Ultra bets on compactness rather than raw power. One detail that few spec sheets spell out changes the picture: plugging in both ports at once never adds up to 53W (35+18), it shares the same 35W budget.
Published on September 22, 2026 by Pierre
With a flat 84 x 48 x 14 mm case, this GaN charger promises the power of a laptop brick in the smallest footprint in the Ugreen lineup. The main port genuinely delivers its 65W, but this record-thin format comes with a documented trade-off: a high surface temperature and a faint electronic whine that the product page never mentions.
Published on September 22, 2026 by Pierre
24W total output with 2.4A guaranteed on each port even when both are used at once: this Anker charger without USB-C or fast charging keeps a simple promise, and its electrical isolation withstands thousands of volts without the slightest damage.
Published on September 16, 2026 by Pierre
With real 25W over Qi2.2, this station charges an iPhone, Apple Watch and AirPods at once without any of the three slowing the others down. That speed is limited to up to date iPhone 16 and 17 handsets though, and the whole unit runs noticeably warm once fast charging goes on for a while.
Published on September 16, 2026 by Pierre
Integrated heating rated down to -40 °C, a BMS raised to 300A and native Victron compatibility as standard: this Gen2 goes well beyond the LiFePO4 batteries already reviewed in the same family, but its own datasheet contradicts itself on the maximum charge current, and its 10-year warranty is built around a return to the UK.
Published on September 16, 2026 by Pierre
At 3.3 kg, the EcoFlow 110W solar panel is the lightest and most compact panel in the brand's entire bifacial line, which spans 110 to 400W. Its built-in XT60 cable and kickstand adjustable from 30 to 60° connect it directly to compact River and Delta series stations, but two points are worth clearing up before buying: what the declared 122W bifacial figure actually means, and a product name that also covers an older, heavier, monofacial generation still widely found in tests and reviews online.
Published on September 8, 2026 by Pierre
The built-in metal kickstand really is sturdier than a plastic stand, but it is about the only place this 229g power bank gets ahead of the competition: a weaker magnet, USB-C capped at 20W, and 24mm of thickness, the bulkiest in the comparison.
Published on September 7, 2026 by Pierre
Unveiled at IFA 2026, this 100% USB-C mini power station skips both an AC outlet and a 12V output, two choices that set it apart from its two direct rivals of the same capacity already covered on this site. Its built-in personal fan is a genuine signature feature, but the product is too new for any independent data to exist yet on its efficiency or how well it holds its rated power.
Published on September 6, 2026 by Pierre
A tiny footprint, one USB-C port, one USB-A port: the Anker 30W cigarette-lighter charger keeps a real promise when only one device is plugged in. With two devices at once, the picture gets more complicated.
Published on September 4, 2026 by Pierre
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
Updated on July 29, 2026
