Overview
- Across 40 phones tested over multiple trials, capacity loss after 500 full cycles was nearly the same regardless of charging speed.
- In the iPhone-specific trial, slowly charged units lost 11.8% capacity versus 12.3% for fast-charged units after 500 cycles.
- Android results were similar, with 120W fast charging showing about a 0.3% difference in battery health compared with 18W after the same cycling.
- Keeping charge levels roughly between 30% and 80% offered a modest benefit of only a few percentage points, and leaving a phone at 100% for extended periods showed no measurable harm.
- HTX Studio’s practical takeaway is to charge however you like, noting that noticeable endurance drops tend to appear under about 85% health, with replacements sensible near 80%.