If you’re looking for a much-larger laptop with a much-longer battery life, you might want to look into the Energizer-branded EnergyBook Pro Ultra. This is a brand-new flagship laptop by Avenir Telecom, who also unveiled two other models next to this one—the EnergyBook Pro 15 and the EnergyBook Pro XL 18—reports The Verge.

The EnergyBook Pro Ultra is equipped with a super-battery with a capacity of 192 watt-hours (13,000mAh), which is said to be the largest battery that’s ever been used in a laptop. Although Energizer boasts a 7-day standby mode, the actual battery life is 28 hours for browsing and 11 hours for demanding tasks like gaming.

Note that FAA regulations require approval for lithium-ion batteries larger than 100 watt-hours, with a strict cap of 160 watt-hours. That means this massive battery won’t be allowed on planes.

Other features include an 18-inch 1920×1200 screen, AMD Ryzen 5 processor, 16GB of DDR4 memory, and a 512GB SSD. As for cost, we’re looking at €449 ($523) as a starting price for one of the smaller models.