A very important report from September 2025 for users of 18650 lithium-ion battery cells: [Wayback/Archive] The Lumafield Battery Quality Report.
Summary:
… beneath the surface, a hidden world of quality control issues and dangerous counterfeits puts consumers and manufacturers at risk.
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Our automated analysis focused on key indicators of cell safety and quality, including anode overhang (AOH) and edge alignment, two critical factors that directly impact battery performance and safety.
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Flawed anq quality battery cells:
The Wiert Corner - irregular stream of stuff 