Swatch claims it’s working on a “revolutionary” smartwatch battery that lasts six months on a charge.

CEO Nick Hayek revealed the plans in an interview with a Swiss newspaper, saying that the watchmaker is “working intensively” with its research group Belenos and battery producer Renata. The battery tech will also be available to automobiles, Hayek said. Reuters confirmed Hayek’s comments with a Swatch spokesman.

Keep in mind that Swatch has made some grand claims before, only have things work out a bit differently.

In February, Hayek told Bloomberg that it would release a smartwatch within three months that didn’t need charging and would support mobile payments. The non-charging watch turned out to be the Touch Zero One, which uses a standard months-long Swatch battery and is focused on tracking beach volleyball. NFC tracking appears destined for a different, still-unrevealed watch, which Swatch now plans to release in July or August according to Reuters.

Why this matters: A six-month battery for actual smartwatches—display and all—would be a huge deal, if that’s what Swatch is promising. Most current smartwatches, including the Apple Watch, last a day or two on a charge, so they’re not ideal for sleep tracking and require a separate charger to take on trips. (Pebble is an exception, though its display isn’t as bright, crisp, or colorful as a result.)

Still, a major leap forward in battery life would likely require new battery chemistry, which researchers have promised for years but have never managed to take beyond the lab. As much as we’d love a true battery revolution, there’s got to be a catch in here somewhere.