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Wearable Battery Technology

1 post · Jun 2026

What this trail covers

Meta's AI glasses require ultra-narrow batteries to fit into the temple arms. Traditional pouch cells are insufficient due to their inability to be reshaped and their wasted volume. Meta has developed steel-can batteries with widths as narrow as 7mm, a significant advancement over existing technologies. This was achieved by replacing the traditional wound electrode architecture with die-cut stacked layers, resulting in lower impedance and improved peak power delivery. Subsequent generations have seen capacity increases and system-level efficiency improvements. The Oakley Meta Vanguards feature a battery in each temple arm, introducing cross-charging risks and sequencing complexity. The Meta Ray-Ban Display glasses introduced a 248 mAh cell for sustained screen power. The technology is being scaled across vendors for future wearables.

All Meta trails
  1. How Meta Engineered Ultra-Narrow Batteries for AI GlassesThis post details Meta's engineering efforts in developing ultra-narrow steel-can batteries for AI glasses. It explains the limitations of traditional pouch cells for this form factor and introduces Meta's solution: die-cut stacked electrode layers instead of wound jelly rolls, resulting in lower impedance and improved peak power delivery. The post also discusses challenges and advancements across different generations of smart glasses, including managing dual batteries in the Oakley Meta Vanguards and the power demands of the Meta Ray-Ban Display glasses. It highlights system-level efficiency gains from hardware and software improvements contributing to increased runtime.