A new ultra-thin battery design could soon change what we expect from item trackers, and it’s already being positioned as a compelling alternative to Apple’s AirTag.
The standout detail is the battery itself. Developed by Flint Labs, it resembles a familiar coin cell, but it’s dramatically slimmer than what most trackers use today. The battery measures just under 0.04 inches thick, which is a major reduction compared to the CR2032 coin cell found in an Apple AirTag at about 0.13 inches thick. That difference could open the door to trackers that are noticeably thinner, easier to conceal, and more comfortable to attach to wallets, bags, luggage, or keychains without adding bulk.
Beyond size, the battery is being promoted as a greener option. It’s described as cellulose-based, and Flint Labs suggests it’s more environmentally friendly than conventional lithium-based batteries. The company even claims the battery is biodegradable, though it has not shared specific details about the exact materials or how the biodegradation process works in real-world conditions. Still, the idea of a thinner tracker powered by a potentially eco-friendlier battery is likely to appeal to buyers looking for both convenience and a reduced environmental footprint.
There are still big questions, especially around performance. Battery life is one of the most important factors for Bluetooth trackers, and so far there’s no official word on how long these new cellulose-based coin cells last in everyday use, how they compare to standard CR2032 batteries, or what the long-term lifespan looks like for devices that rely on them.
The new batteries are expected to be used in four upcoming trackers from Nimble, but the company hasn’t confirmed a launch date yet. Pricing is also unknown, leaving potential buyers waiting for details on availability, cost, and how these trackers will stack up against established options.
For now, the concept is drawing attention for two reasons: the possibility of an exceptionally thin AirTag-style tracker and the promise of a more sustainable battery. If Nimble and Flint Labs can pair that slim design with solid battery life and competitive pricing, this could become one of the more interesting developments in the tracker market this year.
