Energizer, better known for batteries than PCs, is moving into laptops through licensee Avenir Telecom.

Its flagship EnergyBook Pro Ultra is less about raw performance and more about a single headline feature. A 192Wh lithium-polymer battery, one of the largest ever fitted to a notebook.

Avenir claims the Pro Ultra can run for up to 28 hours of office use, around 11 hours of gaming or graphics work, and a week on standby.

That dwarfs the 56–99Wh packs typical in today’s ultrabooks, though the figures remain vendor claims pending independent testing.

The 18-inch machine itself is a solid mid-tier spec.

It pairs an AMD Ryzen 5 processor with 16GB of DDR4 RAM, a 512GB NVMe SSD, and a 1920×1200 display.

Connectivity includes USB-C, HDMI, USB 3.0, SD card reader and a headphone jack.

It takes a while for an Energizer keyboard to run out of battery

The design leans heavily on MacBook Pro styling cues, but the selling point is endurance, not luxury hardware.

There’s a catch. Aviation rules cap lithium-ion batteries in carry-ons at 100Wh, with some exceptions up to 160Wh.

At 192Wh, the Pro Ultra is outside the limit, meaning most airlines won’t allow it in the cabin. That makes it a tool for field workers, students, or off-grid professionals, not frequent flyers.

If Avenir’s endurance promises hold up, Energizer could carve out a niche among buyers who value days of uptime over portability or air-travel practicality. But until reviews confirm the claims, the Pro Ultra remains a curiosity more than a must-buy.

“With the EnergyBook Pro Ultra, we’re pushing the boundaries of what laptops look like. It’s packed with power, battery life, and durability – true to Energizer’s DNA,” said Julien Galou, Avenir Telecom’s head of marketing.

European pricing starts at €449 (about A$800) before tax, though that figure likely applies to a lower-tier model rather than the 192Wh flagship.

Broader details around Australian availability and pricing remain unconfirmed.