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49ers DE Bryce Huff Retires at 27, Pivoting to Lithium‑Ion Battery Safety Startup

The decision follows a wrist injury that spurred a pivot to a lithium‑ion battery safety venture.

Overview

  • Huff announced his retirement in an Instagram video on March 12, and the 49ers said they were notified and thanked him for his 2025 contributions.
  • He said he is founding Naberstone to build safety infrastructure addressing lithium‑ion battery fire risks, outlining suppression, detection and containment technology.
  • Reports noted a $1 million roster bonus was due Friday and he had one year remaining on his contract, creating near‑term roster and salary‑cap effects for San Francisco.
  • Undrafted out of Memphis in 2020, he delivered a 10‑sack breakout with the Jets in 2023 before signing a three‑year, $51.1 million deal with the Eagles in 2024.
  • He earned a Super Bowl LIX ring with Philadelphia, was traded to San Francisco in 2025, and recorded four sacks in 15 games last season.