Forget the Apple Watch Ultra 3, this E Ink smartwatch offers 400 days of juice to obliterate its battery rivals
The LightInk smartwatch offers an impressive 400 days of battery life, significantly outperforming competitors like the Apple Watch Ultra 3. It achieves this longevity through an E Ink display and solar charging capabilities, making it ideal for users prioritizing battery efficiency. However, the watch lacks advanced features and requires users to assemble it themselves using a 3D printer.
- ▪The LightInk watch boasts 400 days of battery life on a single charge.
- ▪It utilizes an E Ink display and solar charging to maximize battery efficiency.
- ▪The watch is an open-source project, requiring users to 3D print components and assemble it themselves.
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| Original publisher | TechRadar |
| Canonical URL | https://www.techradar.com/health-fitness/smartwatches/forget-the-apple-watch-ultra-3-this-e-ink-smartwatch-offers-400-days-of-juice-to-obliterate-its-battery-rivals |
| Publication time | Tue, 19 May 2026 16:30:00 +0000 |
| Retrieval time | 2026-05-19T16:34:57.902Z |
| Last seen | 2026-05-19T16:35:06.527Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | pDL8HB0hhd1p |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
Health & Fitness Smartwatches Forget the Apple Watch Ultra 3, this E Ink smartwatch offers 400 days of juice to obliterate its battery rivals News By Alex Blake published 19 May 2026 It keeps going and going and going and… When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. (Image credit: LightInk) 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 lifeIt does this by stripping back features and using an E Ink displayIt also adds solar charging to stay topped up on the goFrom the Apple Watch Ultra 3 to the Google Pixel Watch 4, customers looking…
Excerpt limited to ~120 words for fair-use compliance. The full article is at TechRadar.
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