The Surprising Flaws in 18650 Lithium-Ion Batteries

Summary by Krater

Adam Savage and experts from Lumafield use industrial X-ray CT scanning to analyze the internal structure and manufacturing quality of various 18650 lithium-ion batteries and consumer power banks, concluding that high-end cells show consistent alignment while low-cost and counterfeit batteries exhibit severe internal defects.

From the video

Answers: What are the internal manufacturing differences and safety defects in cheap versus high-end lithium-ion batteries?

• Industrial X-ray CT scanning
• Lithium-ion battery internal structure
• Manufacturing quality control in batteries
• Battery safety features and defects
• Counterfeit and low-cost battery analysis

What it concludes

• 33 percent of low-end 18650 batteries scanned had a dangerous cathode overhang defect.
• Counterfeit and low-cost batteries exhibit poor electrode alignment, including cathode overhang and splitting, leading to lifetime reliability and safety risks.
• High-end OEM cells maintain tight process controls with straight electrode lines and proper anode overhang.
• Low-cost power banks purchased online can have severely defective internal winding and empty compartments despite high advertised capacities.