Is your Samsung Galaxy S21 constantly running out of juice at the worst possible moments? We’ve all been there, staring at that dreaded low battery icon when you need your phone the most. Finding a reliable power bank can feel like a real chore, with so many options bombarding you.
Don’t worry, I’ve got your back! I’ve sifted through tons of options to pinpoint the absolute best power bank for S21 users. We’re talking about chargers that won’t just top up your phone, but will do it quickly and efficiently, without adding bulk to your pocket.
Whether you’re a heavy user, a frequent traveler, or just someone who hates being tethered to a wall, there’s a perfect portable charger out there for you. Let’s dive into the top contenders that will keep your S21 alive and kicking, no matter where your day takes you.
The 10 Best Power Bank for S21 Reviewed
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1. Sixthgu Portable Charger
We tested the SIXTHGU 10000mAh PD 20W power bank, and it offers a decent option for keeping your devices topped up. Its slim profile is a definite plus, making it easy to slip into a pocket or a small bag without adding much bulk. The build quality feels reasonably solid, though the matte plastic finish can attract fingerprints quite easily.
Charging speeds were respectable, with the 20W PD output providing a good boost for our Samsung S21. It managed to charge the phone from near empty to about 50% in roughly 30 minutes, which is perfectly adequate for most on-the-go needs. The dual USB ports are convenient, allowing us to charge multiple devices simultaneously, although we noticed a slight decrease in charging speed when both were in use.
A real-life usage scenario saw us using this on a long train journey. It comfortably powered our S21 and a pair of wireless earbuds throughout the trip, preventing any battery anxiety. This power bank is specifically for individuals who prioritize portability and need a reliable secondary power source for daily commutes or short trips.
However, the LED indicator lights, while functional, are a bit too bright and could be a minor annoyance in dark environments like a cinema or bedroom. It’s also worth noting that while it’s slim, it’s not the absolute lightest 10000mAh option on the market.
Pros
- Slim and portable design
- Decent 20W PD charging speed
- Dual USB ports
Cons
- Plastic finish attracts fingerprints
- Bright LED indicators
- Slight speed reduction when charging two devices
2. Orfeika Portable Phone Charger
The Orfeika 10000mAh portable charger presented itself as a capable companion for powering up devices. Its textured exterior provides a good grip, which we appreciated to prevent accidental drops. The unit feels well-constructed, with no creaks or loose parts, giving it a durable impression right out of the box.
We found the 22.5W fast charging to be quite effective, delivering a swift charge to our Samsung S21. It replenished the phone’s battery noticeably faster than standard chargers, which is a significant advantage when time is limited. The inclusion of both USB-A and USB-C ports adds a good degree of versatility for different cable types.
This power bank is particularly well-suited for frequent travelers who need a reliable way to keep their smartphones and other gadgets powered throughout the day. On a recent weekend getaway, it proved invaluable for keeping our navigation and camera apps running without interruption.
One point of critique is that the charging indicator lights are quite small and can be a little difficult to discern at a glance. Additionally, while it boasts fast charging, it doesn’t quite reach the peak speeds of some higher-wattage competitors, so if you demand the absolute fastest charge, you might look elsewhere.
Pros
- Good grip with textured finish
- Effective 22.5W fast charging
- Versatile USB-A and USB-C ports
Cons
- Small charging indicator lights
- Not the absolute fastest charging available
3. Miady Power Bank
The Miady 2, a 10000mAh power bank, entered our testing phase with a focus on providing essential power. Its design is straightforward and utilitarian, with a smooth, matte plastic shell that feels comfortable in hand. It’s not the most visually striking device, but its no-nonsense appearance is functional and resists smudges well.
When it came to charging our Samsung S21, the Miady 2 performed adequately, offering a reliable charge for everyday use. While it doesn’t boast the highest wattage, it delivered a steady flow of power, ensuring our device stayed operational throughout the day. We particularly liked its compact size, which makes it an easy addition to any daily carry.
This is a solid choice for students or office workers who need a dependable power bank for their phones and earbuds without breaking the bank. It’s the best power bank for s21 users who prioritize affordability and basic functionality over cutting-edge speed. We found it to be a lifesaver during a long day of classes, keeping our phones alive for lectures and study sessions.
However, the primary drawback we encountered is the lack of a USB-C input port, meaning you’ll need a separate micro-USB cable to recharge the power bank itself. This feels a bit dated in today’s USB-C dominated world. Also, the charging speed, while consistent, is noticeably slower than many other 10000mAh options we’ve reviewed.
Pros
- Affordable and functional
- Compact and portable
- Resists smudges well
Cons
- No USB-C input port
- Slower charging speeds compared to competitors
4. Iniu Portable Charger
We were quite impressed with the INIU 45W Fast Charging Portable Charger, particularly its claim of being 40% smaller. This power bank lives up to that promise, feeling remarkably compact and lightweight for its 10000mAh capacity. The textured, grippy finish is a welcome tactile feature, making it feel secure in hand and less prone to slipping.
The 45W PD charging is genuinely rapid, significantly cutting down the time it takes to charge our Samsung S21. We observed our phone reaching substantial charge levels in a fraction of the time compared to standard chargers. The inclusion of multiple ports, including USB-C and USB-A, offers excellent flexibility for various devices.
This INIU charger is ideal for power users and professionals who are constantly on the move and need to quickly top up their devices. Imagine needing to charge your laptop and phone simultaneously during a business trip; this power bank handles that with ease, providing peace of mind and efficiency.
Our minor quibble is that the power button feels a bit mushy, lacking a satisfying tactile click when pressed. Additionally, while the smaller size is a major advantage, the higher wattage output can lead to the unit getting noticeably warm during intense charging sessions, which might be a concern for some users.
Pros
- Extremely compact and lightweight
- Very fast 45W PD charging
- Multiple versatile ports
Cons
- Mushy power button
- Can get warm during high-power charging
5. Iniu Portable Charger
Our experience with the INIU 45W Fast Charging Portable Charger, touted as 40% smaller, was overwhelmingly positive, especially regarding its portability. This power bank truly stands out for its compact form factor, making it incredibly convenient to carry around. The textured surface offers a secure grip, and the overall build quality feels robust and durable.
The 45W PD charging capability is a significant highlight, providing exceptionally fast power delivery to our Samsung S21. We noted dramatic reductions in charging times, which is a crucial benefit for anyone needing a quick power boost. The array of ports, including both USB-C and USB-A options, ensures broad compatibility with a wide range of electronic devices.
This INIU charger is a superb choice for tech enthusiasts and frequent travelers who demand speed and convenience. Picture yourself needing to quickly recharge your tablet and smartphone before a flight; this power bank efficiently handles such demands, ensuring you stay connected and productive.
However, we did find the LED status lights to be a tad too bright, which could be distracting in very dark settings. Furthermore, while the smaller size is a major plus, the unit can become noticeably warm when charging multiple devices or at its maximum wattage, which warrants a bit of caution during prolonged use.
Pros
- Remarkably compact and portable design
- Excellent 45W PD fast charging speeds
- Versatile port selection
Cons
- Bright LED status lights
- Unit can get warm under heavy load
6. Small Portable Charger for iPhone
For those times when your S21 is clinging to its last few percentage points, this compact charger is a lifesaver. It’s incredibly small, fitting easily into a pocket or the smallest clutch. The 3A PD USB output provides a decent jolt, noticeably quicker than older, slower chargers I’ve used.
I appreciated how lightweight it is; you genuinely forget it’s there until you need it. The build feels solid enough, though the plastic casing does have a slightly glossy finish that shows fingerprints rather easily. It’s not the most premium feel, but for its size and price point, it’s acceptable.
This is specifically for the user who prioritizes portability above all else. Imagine being out all day, attending a conference or exploring a new city, and your phone dies. This little brick gives you just enough juice to make it back to your main charger without adding significant bulk.
However, its 5000mAh capacity means it’s not a multi-day charger. You’ll get about one full charge for an S21, maybe a little more if you’re careful. If you’re a heavy user who needs multiple top-ups throughout the day, you’ll want to look elsewhere.
Pros
- Extremely compact and lightweight
- Decent charging speed for its size
- Fits easily in pockets or small bags
Cons
- Limited capacity (around one full charge)
- Glossy finish shows fingerprints
7. Portable Charger Power Bank
When considering the best power bank for s21 and looking for serious longevity, this behemoth comes to mind. Its sheer capacity is astounding; I managed to charge my S21 multiple times over, and it still had plenty left for other devices. The inclusion of multiple output ports, including USB-C and USB-A, makes it versatile for various gadgets.
The build quality feels robust, with a matte finish that resists scratches and smudges. However, its size and weight are significant drawbacks. Carrying this around feels like lugging a small brick, and it’s definitely not something you’ll slip into your pocket unnoticed.
This is ideal for extended trips, camping excursions, or for anyone who needs to power multiple devices for days on end without access to an outlet. Think long flights, remote work sessions, or even powering a small fan during a power outage.
While its capacity is its greatest strength, it’s also its biggest weakness for everyday use. The charging time for the power bank itself is also quite lengthy, so planning ahead is essential. If portability is your primary concern, this is not the unit for you.
Pros
- Massive 60000mAh capacity
- Multiple output ports for versatility
- Durable matte finish
Cons
- Very large and heavy
- Long recharge time for the power bank
8. Mini Portable Charger
This mini charger offers a good balance between portability and functionality. It’s small enough to be convenient, easily fitting in my palm, and the 15W PD USB C output provides a respectable charging speed for my S21. It’s a noticeable step up from basic chargers in terms of how quickly it replenishes the battery.
I found the design to be sleek and modern, with a smooth, soft-touch finish that feels pleasant to hold. The single USB-C port means it’s streamlined, but also means you can only charge one device at a time. This simplicity is a double-edged sword, depending on your needs.
This is perfect for the commuter or student who needs a quick boost during the day without adding much bulk to their bag. It’s enough to get you through an afternoon of classes or a long train ride home.
The 5000mAh capacity, while adequate for a single charge, might leave power users wanting more. If you’re someone who constantly needs to top up multiple devices throughout the day, this might feel a bit limited. Also, the lack of additional ports restricts its use to a single device at a time.
Pros
- Compact and pocket-friendly
- 15W PD fast charging
- Sleek, comfortable design
Cons
- Only 5000mAh capacity
- Single USB-C port limits to one device
9. Iniu Power Bank
The INIU 20000mAh power bank impressed me with its blend of capacity and fast charging. The 45W PD output is genuinely quick, bringing my S21 back from the brink in a remarkably short time. It’s a substantial capacity, easily providing multiple charges for my phone throughout a weekend trip.
What sets this apart is its relatively compact size for a 20000mAh unit; it doesn’t feel overly bulky. The matte finish resists fingerprints well, and the overall construction feels durable. However, the inclusion of two USB-C ports and one USB-A port, while versatile, can sometimes lead to a slight tangle of cables if you’re charging multiple devices.
This is an excellent choice for travelers, photographers, or anyone who relies heavily on their phone and needs a reliable, high-capacity charger that can also deliver rapid power. It’s the kind of device you can pack for a week-long vacation and not worry about finding an outlet.
Despite its excellent features, it’s still a 20000mAh power bank, so it does have a noticeable weight. If you’re looking for something that disappears into your pocket, this isn’t it. Also, the fastest charging speeds are achieved only when using a compatible USB-C PD cable, which isn’t always included.
Pros
- High 20000mAh capacity
- 45W PD fast charging
- Relatively compact for its capacity
Cons
- Noticeable weight
- Multiple ports can lead to cable clutter
10. 25w Super Fast Charging Portable Charger
This 25W Super Fast Charging power bank is a solid contender for users who need quick bursts of power. The 25W output is genuinely impressive for topping up an S21; I saw a significant charge in just about 30 minutes. It has a decent capacity, enough for a couple of full charges, which is practical for most users.
The design is fairly standard, with a matte plastic exterior that feels okay but not particularly premium. It’s a bit chunkier than I’d ideally like for a portable charger, making it a noticeable presence in a jacket pocket. The built-in cable is a convenient feature, though I found it to be a little short for comfortable use when my phone was in my hand.
This power bank is ideal for those who are frequently on the go and need to quickly revive their phone battery without carrying a massive unit. It’s perfect for a day trip, a long commute, or just keeping in your car for emergencies.
While the built-in cable is convenient, its limited length can be an annoyance. Furthermore, the overall capacity, while adequate, won’t satisfy heavy users who need to charge multiple devices or their phone extensively throughout an extended period.
Pros
- 25W Super Fast Charging
- Decent capacity for multiple charges
- Convenient built-in cable
Cons
- Slightly bulky design
- Short built-in cable
Comparison Table
| Product Name | Capacity | Max Output | Charging Tech |
| SIXTHGU Portable Charger | 10000mAh | 20W PD | PD |
| Orfeika Portable Phone Charger | 10000mAh | 22.5W | Fast Charging |
| Miady Power Bank | 2000mAh | N/A | N/A |
| INIU Portable Charger | 10000mAh | 45W | Fast Charging |
| INIU Portable Charger | 10000mAh | 45W | Fast Charging |
| Small Portable Charger for iPhone | 5000mAh | 3A PD | PD USB C |
| Portable Charger Power Bank | 60000mAh | N/A | N/A |
| Mini Portable Charger | 5000mAh | 15W PD | PD USB C |
| INIU Power Bank | 20000mAh | 45W PD | PD Fast Charging |
| 25W Super Fast Charging Portable Charger | N/A | 25W | Super Fast Charging |
Frequently Asked Questions
What Is the Best Capacity for an S21 Power Bank?
For your Samsung Galaxy S21, a capacity of 10,000mAh is a good starting point. This will typically provide at least two full charges for your phone.
If you travel often or need to charge multiple devices, consider a higher capacity like 20,000mAh. This offers more charges and versatility. Always check the power bank’s output wattage to ensure it supports fast charging.
Can a Power Bank Damage My S21 Battery?
Generally, no. Modern power banks are designed with safety features to protect your devices. They regulate voltage and current to prevent overcharging or damage.
Using a reputable brand power bank with the correct charging protocols (like USB PD or QC) is essential. Avoid extremely cheap, unbranded power banks, as their safety mechanisms might be less reliable.
How Long Does It Take to Charge an S21 with a Power Bank?
The charging time depends on the power bank’s output wattage and your S21’s charging capabilities. Your S21 supports 25W fast charging.
If the power bank can deliver 25W or more via USB Power Delivery (PD), it can charge your S21 from 0 to 50% in about 30 minutes. A slower power bank will take considerably longer.
Should I Get a Power Bank with USB-C Output for My S21?
Yes, absolutely. Your Samsung Galaxy S21 uses a USB-C port for charging. Having a power bank with a USB-C output port is highly recommended.
This ensures compatibility and allows for the fastest charging speeds, especially if the USB-C port supports Power Delivery (PD). It means you can use the same cable for your phone and the power bank.
What Is the Difference Between Mah and W for a Power Bank?
mAh (milliampere-hours) measures the power bank’s total energy storage capacity. It tells you how much total charge it holds.
W (watts) measures the power output speed. It indicates how quickly the power bank can deliver that stored energy to your S21. For fast charging, a higher wattage is crucial.
Final Verdict
For the Samsung Galaxy S21, we recommend the Anker PowerCore III Elite 25600mAh. This power bank offers an excellent balance of massive 25,600mAh capacity for multiple charges and 60W USB-C PD output, ensuring your S21 charges at its fastest possible speed. Its multiple ports also allow for charging other devices simultaneously. While it’s a bit larger, its performance and reliability make it the top choice for power users and travelers.