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Charge the Galaxy S21 by connecting its USB-C port to a compatible USB-C cable and power adapter, then plugging the adapter into a wall outlet. The S21 supports up to 25W wired charging and 15W wireless charging. Samsung did not include a wall adapter in the S21 box, although the supplied USB Type-C cable can be used with a compatible adapter.
Charge the Galaxy S21 with a cable
- Insert the USB-C cable into the Galaxy S21’s USB-C port.
- Connect the other end to a compatible power adapter.
- Plug the adapter into a wall outlet.
- Check for the charging indicator on the phone’s screen.
A computer USB port or another device can charge the phone, but Samsung says this normally takes longer than using a wall adapter. Use an undamaged cable and a compatible, approved charging accessory.
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Which wired charger gives the S21 fastest charging?
Samsung rates the Galaxy S21, S21+, and S21 Ultra for up to 25W wired charging. To use Super fast charging, Samsung’s S21 guidance calls for an approved USB Power Delivery 3.0 charger. A USB PD 2.0 charger provides Fast charging instead. A charger’s wattage label alone does not guarantee that the phone will charge at that rate.
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- Open Settings.
- Tap Battery and device care.
- Tap Battery.
- Open More battery settings.
- Enable Fast charging or Super fast charging, as applicable.
Samsung notes that menu names and locations can vary by software version. Its listed Fast charging standards include Adaptive Fast Charging (AFC), USB PD 2.0, and Quick Charge 2.0. Samsung lists a 15W Adaptive Fast Charging adapter class and 25W or 45W Super fast charging adapters, but the Galaxy S21 itself is a 25W phone; a 45W adapter does not raise its maximum to 45W.
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- [PD25w Samsung Super Fast Charger] - 25 watt Type C charging block for samsung phones & 10ft samsung charger fast charging cord, charges Samsung Galaxy S26/S25/S24/S23 from 0 to 100 percent in about 60 min or full charges iPad Pro 12.9 inch in 2 hours. It is 5 times as fast as standard fast charger usb c, 10 times as fast as PC USB port and saves your time.
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What is in the box?
Samsung’s S21 Series charging guidance states: “A Charging adapter is not included with the in-box items.” The supplied USB Type-C cable is intended for use with a compatible adapter you already own or purchase separately.
Charge the Galaxy S21 wirelessly
- Connect a compatible wireless charging pad to its power supply.
- Place the pad on a stable, flat surface.
- Put the Galaxy S21 in the center of the charging surface, with its back against the pad.
- Confirm that the phone shows the wireless-charging indicator.
Samsung lists up to 15W wireless charging for the Galaxy S21 Series. Actual speed depends on the pad, its power adapter, phone temperature, battery condition, case, and alignment, so the 15W rating is not a guaranteed charging time.
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- 【25W PD 3.0 Rapid Charging】The samsung fast charger type c delivers up to 3 Amp to give your phone power at a much faster rate than your standard 1A or 700mA charger, enables your battery from zero to 50% in just 30 minutes, 75% faster than standard type c charger.
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- 【Wide Compatibility】 USBC fast charger is compatible with Galaxy S26/S26 Plus/S26 Ultra, S25/S25+/S25 Ultra, S24/S24+/S24 Ultra, S23/S23+/S23 Ultra, S22/S22+/S22 Ultra, S21/S21+/S21 Ultra/S21FE, S20/S20+/S20 Ultra/S20FE, S10/S10+/S10e, Note 20/10/9/8, S9/S8 (Active/+), Galaxy Tab S11/S10/S9/S8/A9/A8/A7 (Ultra/Plus/FE/FE+/5G), Z Fold 2/3/4, Z Flip 1/3/4, iPad 10th, iPad Pro 13/11/12.9 inch 3/4/5/6th, iPad Air 4/5/6th, iPad mini 6th, AirPods 3rd gen, GOOGLE Pixel 3/XL/2XL/3XL
- 【Package List】Replace or refund within one year without return, lifetime technical support. Package included: 2x PD 25w Type C charger fast charging block and 2x 6FT USBC to USBC Cable Cord.
Keep metal and magnetic objects away
Remove coins, magnetic cards, and other metal or magnetic objects from between the phone and the pad. They can interfere with charging or cause excess heat. A thick or misaligned case can also reduce charging performance.
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Wireless PowerShare: charge another device from the S21
Wireless PowerShare reverses the normal direction: the Galaxy S21 supplies power to a compatible phone, earbuds, watch, or other device placed on its back. It is a reverse-charging feature, not a method for charging the S21 itself. Because it uses the S21’s battery, it is best reserved for occasional top-ups.
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Wired, wireless, or PowerShare?
| Method | What you need | Samsung-published maximum | Best use |
|---|---|---|---|
| Wired wall charging | USB-C cable and compatible wall adapter | 25W | Fastest normal charging and reliable everyday use |
| Wireless pad | Compatible wireless charging pad and power supply | 15W | Convenient desk or bedside charging without plugging in a cable |
| Wireless PowerShare | Compatible device placed on the S21’s back | Not a charging method for the S21 | Emergency or occasional charging of another device |
For a wired setup, compare the charger’s supported protocol and output rather than choosing solely by a high wattage number. For wireless charging, compatibility and stable placement matter more than an advertised peak that the phone may not use.
If the Galaxy S21 does not start charging
- Reseat every connection: firmly reconnect the cable at the phone and adapter, then check that the adapter is plugged into a live outlet.
- Inspect the USB-C port and cable: remove visible foreign material and do not use a damaged cable or connector.
- Allow time after complete discharge: Samsung says a deeply discharged phone may take up to 10 minutes before the charging indicator appears.
- Try a compatible wall adapter: a computer port may charge slowly, and third-party chargers may not support the S21’s Fast or Super fast charging modes.
- For wireless charging, reposition the phone: center it on the pad and remove metal, magnetic cards, or an obstructive case.
- Control heat: move the phone to a cool, ventilated location and avoid charging with damaged or incompatible accessories.
Charging habits that help battery health
Samsung advises avoiding conditions that make the phone excessively hot, not allowing the battery to remain completely drained, and charging in smaller amounts when practical. These precautions do not change the S21’s 25W wired or 15W wireless product ratings; they help reduce avoidable stress during charging.
Quick Recap
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- Super Fast Charging 2.0- Samsung super fast charger with maximum power of 45 Watt Super Fast Charge capability uses Power Delivery technology to provide the most efficient charge possible. Super fast charge for Samsung Galaxy S26/S25/S24 Ultra from 0% to 50% in just 20 min, more higher than 15W or 25W charger.
- 【Samsung Charger Fast Charging Cord】 The USB C charger cable fast charging block kit comes with a 100W detachable USB C to USB C cable, super charge with max 5A current for your phone from any other USB-C power source such as your phones, tablets, and computers. Use the cable to sync and transfer files at blazing speeds with your Galaxy phones or any other compatible smartphone or laptop.
- Compatible Models-45W Super Fast Charging 2.0 max. 45W for Samsung Galaxy S26+, S26 Ultra, S25 Ultra, S25+, S24 Ultra, S24+, S23 Ultra, S23+, S22+, S22 Ultra, Note 10+(5G), and more future devices. 25W Super Fast Charging 1.0 for Samsung Galaxy S26/S25/S24/S23/S22/S21 / S21+ / S21 Ultra/S20/S20+/, Note 10, Note 20, Galaxy Z Fold, Galaxy Z Flip. Other compatible devices include iPhone 18 Pro/Pro Max, iPhone DUO, and iPhone 17/16/15 series.
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- [USB C Charger Block]25W PD USB Type C power delivery wall plug, PD adapter 3.0 Quickly Charge USB C port provides Max 25W output power, Adaptive fast charger charges from 0 to 50% in just 30 minutes, 75% faster than standard chargers. Helps You Work Efficiently.
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- [USB C Charger ]Fast Charging cable reduced charging cable resistance enable the provision of the fastest possible charge via any type-C charger. Length of 6 feet, easy for charging on different occasions, for travel, home, car, office, etc.
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