AirTags already have a decently long battery life, but you will end up needing to replace the coin cell every two years or so. If you don't even want to be bothered with that, ElevationLab made just the accessory for you: its AirTag battery case that can power the tracker for up to 10 years is on sale for 30 percent off. You can pick one up for only $16, and it's available in two- and four-packs as well at a discount. The TimeCapsule case uses two AA batteries to offer up to 14 times the lifespan of the CR2032 battery that powers an AirTag. The company based those estimates on Energizer Ultimate Lithium batteries, so your mileage may vary. Once an AirTag is seated inside the case, which is a compact 4.45 x 1.57 inches, it is sealed shut with four screws at the corners. The case is fiber-reinforced, according to Elevation Lab, and rated IP69 waterproof. The company says it’s intended for use cases where you might place an AirTag for long periods of time, like in a vehicle, a piece of luggage or a work bag. We've already got a couple of Elevation Lab products on our list for best AirTag accessories, so while we haven't reviewed the battery case, we tend to like this company's products. If you're in the market for more AirTags or considering picking some up for the first time, you can still get a pack of 4 for just $65, which is only a few dollars off the lowest price we've seen. Follow @EngadgetDeals on X for the latest tech deals and buying advice. This article originally appeared on Engadget at https://www.engadget.com/deals/elevationlabs-10-year-extended-battery-case-for-airtags-is-30-percent-off-162308110.html?src=rss