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687 X-ray Scans Reveal the Hidden Risks of Cheap Batteries

Slashdot
msmash @ Slashdot · 09/25/2025 10:40 EDT

X-ray Scans Reveal the Hidden Risks of Cheap Batteries

Lumafield's CT scan analysis of 1,054 lithium-ion 18650 batteries found 33 cells from low-cost and counterfeit brands contained a serious manufacturing defect called negative anode overhang, which increases risks of internal short-circuiting and battery fires. All defective batteries came from the 424 units sourced from budget brands on Amazon and Temu.

The defect rate reached nearly 8% among low-cost cells, climbing to 12-15% for certain counterfeit brands claiming impossible 9,900 mAh capacities. None o

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