Archive · 20 Nov 2025
Fast Charging: No Harm to Phone Batteries, Studies Show
You can safely use fast charging on your phone without worrying about long-term battery damage.
Just make sure to use certified chargers and avoid high temperatures.
Studies show that fast charging causes almost no extra wear compared to slow charging, and it's heat, not the charging speed, that's the main issue.
To keep your battery healthy, charge it between 20% and 80% and avoid charging in hot places or direct sunlight.
Real-world tests found no significant difference in battery health between fast and slow charging
Fast charging caused less than 0.5% extra wear on both iPhones and Androids
Heat, not fast charging, is the main cause of battery degradation
Certified fast chargers with temperature and voltage controls are safe
Battery experts recommend keeping charge between 20-80% and avoiding high temperatures
- Who
- HTX Studio, a YouTube channel, conducted the test on 40 smartphones
- What
- Compared fast charging vs slow charging over 2 years and 500 charging cycles
- When
- The test was conducted over a period of two years
- Where
- Not specified
- Why
- To determine if fast charging causes extra battery wear in everyday use
Fast Charging Advocates
Slow Charging Advocates
Charging Speed
Fast Charging Advocates
Fast charging is more convenient and does not cause significant extra wear
Slow Charging Advocates
Slow charging is safer and causes less wear, even if it's less convenient
- Test Duration
- 2 years
- Number of Charging Cycles
- 500 per device
- iPhone Battery Loss (Slow)
- 11.8%
- iPhone Battery Loss (Fast)
- 12.3%
- Android Battery Loss (Slow)
- 8.8%
- Android Battery Loss (Fast)
- 8.5%