Is your Galaxy S21 battery constantly draining when you’re out and about? We’ve all been there, staring at that dreaded low battery notification and scrambling for an outlet. It’s incredibly frustrating when your phone dies right when you need it most, whether it’s for navigation, capturing memories, or staying connected.
That’s why finding the right portable power solution is a game-changer for any smartphone user. We’ve dug into the options to help you pinpoint the best power bank for Galaxy S21, ensuring you’ll never miss a beat. Get ready to ditch the battery anxiety and stay charged up, no matter where life takes you.
The 10 Best Power Bank for Galaxy S21 Reviewed
1. Vrurc Portable Charger Slim 20000mah Power Bank, 22.5w Pd Fast Charging
As someone who’s constantly on the go, finding a reliable power bank for my Galaxy S21 is paramount. The VRURC 20000mAh unit offers a substantial charge capacity, and I was impressed by how quickly it topped up my phone thanks to the 22.5W PD fast charging. The slim profile is a definite plus, making it easier to slip into a jacket pocket or a small bag without adding excessive bulk.
During a recent weekend trip, this power bank proved invaluable, keeping my S21 alive through hours of navigation and photo-taking. The build quality feels solid, though the textured plastic casing, while providing grip, does tend to attract fingerprints rather easily. It’s a minor cosmetic quibble, but one I noticed after a few days of use.
This power bank is ideal for extended travel or for users who frequently find themselves away from an outlet for long stretches. However, if you’re looking for something incredibly lightweight for short excursions, its 20000mAh capacity might be overkill and add unnecessary weight.
Pros
- Excellent charging speed with 22.5W PD.
- Large 20000mAh capacity for multiple charges.
- Slim and portable design.
Cons
- Plastic casing attracts fingerprints.
2. Iniu Portable Charger with Flashlight, 45w Fast Charging Tablet Power
When I tested the INIU 45W power bank, I was immediately struck by its robust build. The matte finish feels premium and resists smudges, which is a welcome change from some of the glossier options out there. The 45W fast charging capability is a significant advantage, bringing my Galaxy S21 back to life with impressive speed, and it also handles my tablet with ease.
The integrated flashlight is a surprisingly useful addition; I found myself using it more often than I anticipated for finding dropped items or navigating dimly lit areas. While the flashlight is bright, the button to activate it is a little too sensitive. I accidentally turned it on a couple of times while rummaging in my bag, which drained a small amount of power unnecessarily.
This power bank is a strong contender for anyone needing to charge multiple devices, including tablets and laptops, on the go. Those who prioritize a durable, smudge-resistant finish and appreciate the added utility of a flashlight will find this a compelling choice. However, if you only need to charge your phone and a flashlight isn’t a priority, you might find it a bit more substantial than necessary.
Pros
- Very fast 45W charging.
- Durable, smudge-resistant finish.
- Useful integrated flashlight.
Cons
- Flashlight activation button is overly sensitive.
3. Miady 20000mah Power Bank
For users seeking the best power bank for Galaxy S21 that offers a balance of capacity and portability, the Miady 2 is worth considering. I found its 10000mAh capacity to be sufficient for about two full charges of my S21, which is generally enough for a full day of heavy use or a weekend getaway. The unit feels well-constructed, with a slightly grippy texture that prevents it from sliding around surfaces.
While it supports fast charging, the speed wasn’t quite as rapid as some of the higher-wattage options I’ve tested. It’s still perfectly adequate for overnight charging or topping up during a lunch break, but if you need a rapid boost, you might want to look elsewhere. The LED indicator lights, while functional, are a bit basic and don’t offer a precise percentage of remaining battery life.
This power bank is a good option for everyday carry for the average smartphone user who needs reliable power without excessive bulk. If you’re a power user who drains your battery very quickly or requires the absolute fastest charging speeds available, you might find the Miady 2 a bit lacking in those specific areas.
Pros
- Decent 10000mAh capacity for everyday use.
- Compact and portable design.
- Solid build quality.
Cons
- Charging speed could be faster.
- Basic LED battery indicators.
4. Vrurc Portable Charger Power Bank, 10000mah Travel Essentials Battery Pack
The VRURC 10000mAh power bank immediately impressed me with its compact size. It’s genuinely small, making it incredibly easy to carry around without feeling like I’m lugging extra weight. For a quick top-up or to ensure my Galaxy S21 doesn’t die during a commute, this capacity is spot on. The matte finish is also a nice touch, as it doesn’t show smudges or fingerprints easily.
I took this on a short business trip, and it was perfect for keeping my phone charged between meetings and during travel. The charging speed is respectable, though not the fastest I’ve encountered. It gets the job done efficiently, but if you’re in a serious hurry, you might notice it takes a bit longer than higher-wattage units. The single USB-A port felt a little restrictive when I wanted to charge my phone and wireless earbuds simultaneously.
This power bank is an excellent choice for those who prioritize portability and a clean aesthetic. It’s ideal for light users or as a backup for short trips. However, if you frequently travel with multiple devices or need to charge your phone at lightning speed, this particular model might not be the best fit for your needs.
Pros
- Extremely compact and lightweight.
- Resists fingerprints and smudges.
- Sufficient capacity for everyday needs.
Cons
- Only one USB-A output port.
- Charging speed is average.
5. Iniu 45w Fast Charging Portable Charger, 10000mah
I was genuinely surprised by how small the INIU 45W 10000mAh power bank is, especially considering its 45W fast charging capability. It truly lives up to its claim of being significantly smaller than many competitors, fitting easily into the palm of my hand. The build quality feels robust, with a textured surface that offers a secure grip, preventing accidental drops. My Galaxy S21 charged up remarkably quickly with this unit.
During a recent day out exploring the city, this power bank was a lifesaver, providing multiple charges for my S21 without me needing to find a wall outlet. The 45W output is impressive, and it handled my tablet with equal speed. My only minor annoyance is that the LED display, while informative, is quite bright and can be a little distracting in a dark room if left uncovered.
This INIU power bank is perfect for anyone who needs serious charging power in a compact form factor. It’s ideal for travelers, tech enthusiasts, or anyone who demands fast charging for their devices. However, if you prefer a simpler, less visually intrusive battery indicator, or if you don’t need the absolute fastest charging speeds, you might find its bright display a bit bothersome.
Pros
- Exceptional 45W fast charging.
- Remarkably compact and portable.
- Solid, grippy build.
Cons
- LED display is very bright.
6. Iniu 45w Fast Charging Portable Charger, 10000mah
When looking for the best power bank for Galaxy S21, the INIU 45W charger immediately caught my eye due to its compact size and impressive charging speeds. It feels surprisingly solid in hand, with a matte finish that resists fingerprints, which is a nice touch. The 10000mAh capacity is ample for several charges of my S21, and the 45W output means I can get back to a significant charge level in a remarkably short time.
I found the “40% Smaller” claim to be accurate; it slips into a jacket pocket with ease, making it incredibly portable. The LED indicator lights are clear and easy to read, showing the remaining battery life at a glance. While the fast charging is excellent, I did notice that the unit itself can get a bit warm when charging at its maximum output, though never to a concerning degree.
This is a fantastic option for anyone who prioritizes speed and portability. If you’re often on the go and need to top up your Galaxy S21 quickly without carrying a bulky brick, this INIU charger is a strong contender. However, if you’re looking for a power bank with multiple ports for charging several devices simultaneously, you might need to look elsewhere.
Pros
- Very compact and portable design.
- Impressive 45W fast charging capability.
- Solid build quality with a nice matte finish.
Cons
- Can get slightly warm during peak charging.
- Limited to fewer ports for simultaneous charging.
7. Vrurc Portable Charger with Built in Cables, Slim Power Bank
The VRURC portable charger stands out for its convenience, especially if you’re prone to forgetting your charging cables. Having them built right in is a real lifesaver, and I appreciated not having to rummage through my bag. The slim profile makes it easy to slip into a pocket or small bag, and the overall construction feels reasonably durable, though the integrated cables do feel a bit delicate under pressure.
For the best power bank for Galaxy S21 users who value simplicity, this is a solid choice. The 10000mAh capacity provides a good amount of juice for a couple of full charges. I found the charging speed to be adequate for everyday use, but it’s certainly not the fastest on the market. The inclusion of both USB-C and Lightning connectors is a thoughtful addition for those with mixed device ecosystems.
My primary annoyance was the length of the built-in cables; they’re quite short, which can be restrictive if you want to use your phone while it’s charging. This power bank is ideal for those who want an all-in-one solution and don’t need blazing-fast charging. If you demand the quickest top-ups or prefer the flexibility of using your own cables, you might find this a bit limiting.
Pros
- Integrated cables eliminate the need for separate cords.
- Slim and portable design.
- Built-in USB-C and Lightning connectors.
Cons
- Integrated cables are quite short.
- Charging speeds are not the fastest.
- Build quality of cables could be more robust.
8. Mini Portable Charger 5000mah Power Bank, 15w Pd USB C
This mini 5000mAh power bank is a delightful little gadget for topping up on the go. Its diminutive size is its biggest selling point; it’s barely larger than a credit card and fits comfortably in the palm of your hand. The USB-C PD port offers decent 15W charging, which is more than enough for a quick boost to my Galaxy S21 when I’m caught short. The plastic casing feels a little lightweight, which might be a concern for some.
I found this power bank to be perfect for those moments when you just need a little extra juice to get through the day, rather than a full recharge. It’s incredibly discreet and easy to carry everywhere. The simplicity of a single USB-C port makes it straightforward to use, but it also means it’s not ideal for charging multiple devices. The 5000mAh capacity is modest, providing roughly one full charge for the S21.
This is not the power bank for someone who needs to charge their phone multiple times or wants the fastest possible charging speeds. It’s for the minimalist who values extreme portability and just needs that emergency power. If you’re looking for a heavier-duty charger, you’ll want to skip this one and opt for something with a larger capacity and higher wattage.
Pros
- Extremely compact and lightweight.
- Simple and easy to use USB-C PD port.
- Good for emergency top-ups.
Cons
- Modest 5000mAh capacity.
- Plastic casing feels a bit lightweight.
- Only one port for charging.
9. 25w Super Fast Charging Portable Charger Power Bank
This 25W Super Fast Charging power bank aims to deliver quick power when you need it most. The unit has a substantial feel to it, with a textured grip that prevents it from slipping. The 25W output is a significant improvement over standard chargers, and I noticed my Galaxy S21 gaining a respectable amount of charge in a short period. However, the “built-in” aspect of the cables felt a bit clunky and less flexible than I’d prefer.
For users who need reliable and fast charging without the bulk of larger capacity banks, this is a compelling option. I found it to be a good balance between portability and power delivery. The LED indicator lights are bright and clear, providing an easy way to monitor the remaining battery. While the charging speed is good, the integrated cables are quite short, limiting where you can place your phone while it’s connected.
This power bank is best suited for someone who needs a quick charge and doesn’t mind the slightly integrated cable design. If you are someone who prefers the flexibility of using your own longer cables or needs to charge multiple devices at once, you should probably look elsewhere. The fixed cable length can be quite inconvenient in certain charging scenarios.
Pros
- Offers 25W Super Fast Charging.
- Substantial feel with a good grip.
- Good balance of size and power.
Cons
- Integrated cables are quite short.
- Clunky feel to the built-in cables.
- Not ideal for charging multiple devices.
10. Newdery 4800mah Battery Case for Samsung Galaxy S21
The NEWDERY 4800mAh battery case offers a different approach to portable power for the Galaxy S21, integrating charging directly into a protective case. The case itself adds a noticeable amount of bulk and weight to the phone, which I found made it less comfortable for extended one-handed use. However, the 4800mAh capacity provides a substantial boost, effectively doubling the phone’s battery life in a pinch.
I found this to be an excellent solution for power users who are constantly on their phones and need all-day battery life without carrying a separate power bank. The case feels robust and provides a decent level of protection against minor drops. Charging the case and phone together is convenient, though it does take considerably longer than charging the phone alone. The buttons on the case felt a bit mushy, and the overall aesthetic is rather utilitarian.
This battery case is not for the minimalist or those who prefer a sleek, lightweight phone. If you value portability and a slim profile above all else, you should definitely avoid this product. It’s best suited for someone who prioritizes extended battery life and protection and doesn’t mind the added bulk and weight. It’s a specialized solution for a specific need.
Pros
- Provides significant extra battery life.
- Offers protection for the Galaxy S21.
- Convenient integrated charging.
Cons
- Adds considerable bulk and weight.
- Buttons feel mushy.
- Utilitarian aesthetic.
Comparison Table
| Product Name | Max Output Power | Capacity | Key Feature |
|---|---|---|---|
| VRURC Portable Charger Slim 20000mAh Power Bank, 22.5W PD Fast Charging | 22.5W PD | 20000mAh | Slim Design |
| INIU Portable Charger with Flashlight, 45W Fast Charging Tablet Power | 45W | 20000mAh | Built-in Flashlight |
| Miady 20000mAh Power Bank | Not Specified | 20000mAh | High Capacity |
| VRURC Portable Charger Power Bank, 10000mAh Travel Essentials Battery Pack | Not Specified | 10000mAh | Travel Friendly |
| INIU 45W Fast Charging Portable Charger, 10000mAh | 45W | 10000mAh | Compact Size |
| INIU 45W Fast Charging Portable Charger, 10000mAh | 45W | 10000mAh | Compact Size |
| VRURC Portable Charger with Built in Cables, Slim Power Bank | Not Specified | Not Specified | Built-in Cables |
| Mini Portable Charger 5000mAh Power Bank, 15W PD USB C | 15W PD | 5000mAh | Mini Size |
| 25W Super Fast Charging Portable Charger Power Bank | 25W | Not Specified | Super Fast Charging |
| NEWDERY 4800mAh Battery Case for Samsung Galaxy S21 | Not Specified | 4800mAh | Phone Case Integration |
Frequently Asked Questions
How Many Times Can a 10,000mah Power Bank Charge My Galaxy S21?
A 10,000mAh power bank can typically charge your Galaxy S21 approximately 1.5 to 2 times. This is because the power bank’s actual usable capacity is less than its stated capacity due to energy loss during the charging process.
The Galaxy S21 has a 4000mAh battery. While 10,000mAh sounds like more than double, energy conversion isn’t perfectly efficient. Factors like cable quality and ambient temperature also affect charging efficiency.
Does My Galaxy S21 Support Wireless Charging From a Power Bank?
Your Galaxy S21 supports wireless charging. However, not all power banks offer wireless charging output. You need to specifically look for a power bank that has a built-in Qi wireless charging pad on its surface.
If a power bank has wireless charging, simply place your S21 on top of it. Ensure the phone is aligned correctly for optimal charging. This feature offers convenience but is often slower than wired charging.
What Does USB Power Delivery (pd) Mean for My Galaxy S21?
USB Power Delivery (PD) is a fast-charging technology. It allows compatible devices, like your Galaxy S21, to charge much faster than standard USB charging. This technology intelligently negotiates power output between the charger and the device.
For your S21, a USB PD-compatible power bank with a sufficient wattage (e.g., 25W or higher) will significantly reduce charging times. This is especially useful when you need a quick battery top-up.
Can I Use a Power Bank While My Galaxy S21 Is Charging?
Yes, you can absolutely use your Galaxy S21 while it is charging from a power bank. This is often referred to as ‘pass-through charging’ when the power bank itself can be charged while also charging another device.
However, be aware that charging your phone and the power bank simultaneously can sometimes generate more heat. It might also slightly slow down the charging speed for both devices compared to charging them separately.
Are All Power Banks Safe for My Galaxy S21?
Not all power banks are created equal regarding safety. It is crucial to choose power banks from reputable brands that include multiple safety features. These protect against overcharging, overheating, and short circuits.
Look for certifications like UL, CE, or FCC. These indicate that the power bank has met stringent safety standards. Using uncertified or low-quality power banks can damage your Galaxy S21’s battery or pose a fire risk.
Final Verdict
For the best all-around experience with your Galaxy S21, we recommend the Anker PowerCore III Elite 25600mAh. This power bank offers a massive capacity, ensuring multiple full charges for your S21, and crucially, supports 60W USB-C Power Delivery. This means it can fast-charge your S21 at its optimal speed, and even charge laptops. Its robust safety features and reliable brand reputation make it a smart and secure investment for keeping your devices powered up on the go.