The belief that fast charging damages batteries is not entirely baseless, but it is often misunderstood. What actually causes damage is not 'speed' itself but the heat generated during fast charging; the better that heat is managed, the smaller the negative impact on the battery.
Modern phones use smart charging algorithms to reduce this risk: the battery charges quickly from 0% up to around 50%, then speed is deliberately throttled after 80%. This lets users benefit from fast charging while protecting the battery during the stage it is most sensitive.
Independent testing shows that fast charging done with a quality charger and a good battery management system does not create a dramatic difference in cycle life compared to slow charging. The real damage tends to come from low-quality or uncertified chargers generating uncontrolled heat.
That is why 'avoid fast charging' is the wrong takeaway, 'use quality fast-charging equipment' is the more accurate strategy. A GaN-based charger with proper protection circuits keeps heat under control and substantially reduces the potential risks of fast charging.
Charjett's PD-compliant, thermally protected products are built around exactly that balance: users can charge fast without putting unnecessary stress on their battery.