Overview
- Internal test documents show the 20,000mAh silicon‑carbon smartphone cell failed after 960 charge cycles, prompting a pivot to smaller designs.
- The 12,000mAh unit is a dual‑cell stack of 6,800mAh at 4.7mm plus 5,200mAh at 3.2mm with a target stack under 9.3mm, though 2 of 7 samples exceeded thickness limits.
- The 18,000mAh prototype is a triple‑cell stack of 6,699mAh at 4.2mm, 6,000mAh at 3.9mm, and 5,257mAh at 3.28mm targeting about 12.3mm, but thermal interface layers pushed samples to 12.8mm.
- Both smaller designs target roughly 1,500 charge cycles, with ongoing engineering focused on inter‑cell layer redesigns, stack control, and updated battery‑management firmware.
- Testing notes project 20–25 hours of screen‑on time for the 12,000mAh design, while the 18,000mAh stack emphasizes higher capacity and endurance with durability still under evaluation.