Chinese brand reportedly testing steel-cased batteries with stacked cells

A major Chinese smartphone maker is testing steel-cased batteries paired with stacked-cell construction, according to leaker Digital Chat Station. The approach builds on Apple's metal-cased battery in the iPhone 16 Pro, with the iPhone 18 Pro Max expected to reach 5,391mAh while Chinese flagships could hit 9,000–10,000mAh.

• Chinese brand testing steel battery casing instead of aluminum
• Stacked cells replace wound jelly-roll design for higher density
• iPhone 18 Pro Max expected at 5,391mAh, up about 12%
• Silicon-carbon anodes could enable 9,000–10,000mAh batteries