Is Fast Charging Killing the Battery? A 2-Year Test on 40 Phones [video]

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Over 500 charge cycles, the iPhone fast-charge group lost only 0.5% more capacity than the slow-charge group, while the Android results were similarly negligible.

Additionally, the experiment examined the impact of maintaining battery levels between 30% and 80%, finding that this practice did reduce wear, albeit modestly. A separate test on battery aging revealed that once battery health drops below 85%, users may notice decreased battery life, with a recommendation to replace batteries around 80% health.

The findings suggest that charging habits may not significantly affect battery longevity,