Now a variety of fast charging technology no matter what method will have an impact on the battery life. But the impact is within acceptable limits. After all, people generally use their mobile phones for one or two years and almost replace them. The effect of fast charging on the battery is not obvious during use. The impact of the charging bank on the battery is not big, after all, there are too many charging bank specifications on the market, and the current is unstable when the mobile phone is charging, which hurts the mobile phone
Apple x with 20w fast charge is not hurt the battery, Apple 8 generation after the mobile phone support fast charge.