# Meta — How Meta Engineered Ultra-Narrow Batteries for AI Glasses

- Company: Meta (meta.com)
- Announced: 2026-06-23T16:00:38+00:00
- Subject: Llama / infrastructure
- Models affected: Ray-Ban Meta, Oakley Meta Vanguards, Meta Ray-Ban Display glasses
- Source: https://engineering.fb.com/2026/06/23/production-engineering/how-meta-built-ultra-narrow-batteries-for-ai-glasses-meta-tech-podcast/
- Record: https://forck.live/items/1426-how-meta-engineered-ultra-narrow-batteries-for-ai-glasses

Meta engineers developed ultra-narrow steel-can batteries for smart glasses, achieving widths as narrow as 7mm, and improved capacity across generations, including a 248 mAh cell for display glasses.

## Evidence

Verbatim from https://engineering.fb.com/2026/06/23/production-engineering/how-meta-built-ultra-narrow-batteries-for-ai-glasses-meta-tech-podcast/:

> Meta’s AI glasses needed batteries with widths as narrow as 7mm, narrower than anything that existed before.

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