Studio.image/Shutterstock Whether it’s an iPhone or an Android phone, most modern smartphones support fast battery charging, a feature that can come in handy when you have to top up the handset quickly during the day. That’s when fast charging speeds matter most, as the battery should get a decent charge in a few minutes. For example, iPhone 17 models support up to 40 W charging speeds. The Galaxy S26 Ultra can go up to 60 W, while many of the most powerful Chinese smartphones supp...