Lumafield scanned 10 iPhone 16 batteries, five genuine Apple units and five third-party replacements, and measured the internal electrode geometry that governs cell performance and safety. Electrical testing confirms a battery charges and holds voltage. It cannot see the anode overhang or edge alignment that determines how safely it does so over hundreds of cycles.

The brief walks through what CT resolves inside a sealed cell, and what the measurements reveal about each manufacturing process:

• Anode overhang, where genuine Apple cells held a standard deviation of 0.008mm across five independently manufactured units against the third-party 0.173mm, more than twenty times wider
• Why too little overhang risks lithium plating at the cathode edge while too much wastes active material, and why holding that dimension tight at volume is among the harder problems in battery manufacturing
• Electrode edge alignment, where every third-party unit fell outside the range of every genuine Apple unit
• How both features stay completely invisible to surface inspection and standard electrical testing
• What unit-level inspection across every incoming cell makes possible for a device portfolio at scale