How much does battery health decline after two years of smartphone use

Archived study

Summarizes self-reported battery-health observations for a selected phone model after roughly two years. The archive records selection criteria, descriptive statistics, and source discussions.

Interpretation and limits

These owner reports form a convenience sample, not a representative degradation study. Device history, reporting selection, and the battery-health estimate limit generalization to other phones.

Package and provenance

The original .science export and matching poster are preserved byte-for-byte from the upstream case. The package contains the conversation, session metadata, and the resources inventoried in its internal manifest. This introduction summarizes the archived record; the research, external sources, and model evaluations were not rerun for this import.