![]() ![]() But you need to make sure the USB has decent quality. Samsung shipped this type of wall charger with Galaxy S4 and S5. You need a wall charger that supports 5V 2A output. There are no requirements for the wall charger (adapter). Of course, Galaxy S21 offers more features for battery charging.īased on charging power, Galaxy S21 supports the following USB charging “protocols”: Occasionally, even the USB cable may play a role.Ĭurrent smartphones support at least 5W USB charging. Almost all smartphones support USB cable charging.īut charging speed differs dramatically due to various charging protocols supported and wall chargers (adapters) used. USB cable charging is common among smartphones.
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