With a fast charger from Anker, Belkin, or BlueBuilt, for example, you can charge your smartphone faster than with a regular charger. A 20W Power Delivery charger chargers a lot of iPhone models for 50% in about half an hour. Samsung smartphones often charge for 40% in 30 minutes with a regular fast charger. With a 25W Samsung fast charger or higher, suitable devices charge even faster.