Forget the Apple Watch Ultra 3, this E Ink smartwatch offers 400 days of
juice to obliterate its battery rivals

Date:
Tue, 19 May 2026 16:30:00 +0000

Description:
The LightInk smartwatch has 400 days of battery life, but some serious compromises too

FULL STORY ======================================================================Copy link Facebook X Whatsapp Reddit Pinterest Flipboard Threads Email Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Subscribe to our newsletter The LightInk watch offers 400 days of battery life It does this by stripping back features and using an E Ink display It also adds solar charging to stay topped up on the go From the Apple Watch Ultra 3 to the Google Pixel Watch 4 , customers looking to adorn their wrists with one of the best smartwatches tend to look for wearables
that offer excellent battery life after all, theres no point in shelling out on a device if you spend more time charging it than using it. If battery life is a priority for you, you might want to check out the LightInk watch.

Thats because with 400 days of juice on a single charge, it blows past the competition in terms of battery longevity. How does it achieve that figure? Well, this is no ordinary watch its powered by solar energy to keep itself constantly topped up, meaning you can start charging it even when youre miles from the nearest power outlet. As long as the sun is beaming down on you, the LightInks battery is getting topped up. But youll get 400 days of battery
even before solar charging is taken into account, the projects creator
claims. How? Well, one way is through cutting the feature list right down. As its name suggests, the LightInk uses an E Ink display instead of an AMOLED display, unlike some rival smartwatches. E Ink technology is incredibly efficient on the battery, helping you eke even more life out of this product. Latest Videos From You may like Suunto could be prepping a smartwatch with battery life measured in years The best smartwatch 2026 My pick of the best solar-powered gadgets to buy this Earth Day

And because its an open-source project, theres no fee to obtain one. You just need a 3D printer and a few off-the-shelf components to make it yours.
Extreme battery savings The LightInk's case is based on one from fellow DIY project Watchy. (Image credit: Watchy) Of course, the LightInk isnt all sunshine and roses there are a few downsides to it. Its E Ink screen might grant it excellent battery life, but it comes at the cost of visual fidelity. The LightInks display is monochrome and low resolution, so you shouldnt
expect any eye-catching graphics here. It doesnt even show seconds.

And if youre a fitness nut or believe in the quantified self, youll want to look elsewhere. You wont get any of the health and fitness sensors and
metrics you find in most smartwatches the LightInk can tell the time, occasionally connect to Wi-Fi and GPS, and thats about it.

You also cant just go out and buy the LightInk at your local shopping mall.
As we mentioned before, you need to have a 3D printer on hand to craft many
of the required components yourself, then assemble and solder them into a finished product. Youll also need to be comfortable with building your own firmware based on the resources provided on LightInks GitHub page . Get daily insight, inspiration and deals in your inbox Sign up for breaking news, reviews, opinion, top tech deals, and more. Contact me with news and offers from other Future brands Receive email from us on behalf of our trusted partners or sponsors By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over.

Still, the LightInk doesnt make any claims of being a high-end, flagship device its a deliberately basic product, as this is what allows it to put
all of its energy into maximizing battery life.

Its definitely not for everyone, but if your priority is staying away from your charger for as long as possible, it could be just what youve been
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Link to news story: https://www.techradar.com/health-fitness/smartwatches/forget-the-apple-watch-u ltra-3-this-e-ink-smartwatch-offers-400-days-of-juice-to-obliterate-its-batter y-rivals


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