Best Portable Charger for Galaxy S21: Top Picks 2024
Is your Galaxy S21 constantly dying on you when you’re out and about? It’s a total bummer when you can’t snap that perfect photo or reply to that important message because your battery is in the red.
We get it, finding the right power bank can feel like searching for a needle in a haystack. That’s why we’ve scoured the market to bring you the absolute best portable charger for Galaxy S21 users, ensuring you stay connected and powered up no matter where life takes you.
Forget the low battery anxiety! We’ve focused on chargers that offer rapid charging speeds and enough juice to keep your S21 going all day and then some. Get ready to discover your new favorite travel companion.
The 10 Best Portable Charger for Galaxy S21 Reviewed
1. Cuktech 45w Power Bank 20000mah
The CUKTECH 45W power bank is a hefty unit, clearly designed for those who need serious juice on the go. Its 20,000mAh capacity means you can recharge your Galaxy S21 multiple times over, making it an excellent companion for extended trips or heavy usage days. The 45W output is impressively fast, topping up devices quickly.
During testing, I appreciated the solid build quality; it feels substantial in hand without being overly cumbersome. The matte finish resisted fingerprints well, which is a nice touch for a device that will likely see a lot of handling. However, the included USB-C cable felt a bit short for comfortable use while charging.
This power bank is ideal for photographers, videographers, or anyone who relies heavily on their smartphone for work and entertainment throughout the day. It’s not the most pocket-friendly option, but its sheer capacity justifies the slightly larger footprint. If you prioritize maximum charging cycles and rapid replenishment over ultra-portability, this is a strong contender.
Pros
- Massive 20,000mAh capacity
- Fast 45W charging
- Durable build
Cons
- Included cable is short
- Can be a bit bulky
2. Iniu 45w Fast Charging Portable Charger 10000mah
INIU’s 45W portable charger immediately impressed me with its compact size. For a 10,000mAh capacity, it’s remarkably svelte, making it easy to slip into a jacket pocket or a small bag. The 45W output is a significant advantage, ensuring your Galaxy S21 gets a rapid charge when you’re in a pinch.
I found the textured finish on the casing provided a good grip, reducing the chance of accidental drops. The LED display showing remaining battery percentage is clear and easy to read, a small but welcome detail. My only gripe is that the power button feels a little mushy, lacking a satisfying click.
This charger is perfect for daily commuters, students, or anyone who needs a reliable top-up without adding much bulk to their everyday carry. It strikes a great balance between capacity and portability. If you travel light and demand quick charging speeds, this INIU model is definitely worth considering.
Pros
- Very compact for its capacity
- Fast 45W charging
- Clear LED display
Cons
- Power button feel is mushy
3. Anker Portable Charger 10,000mah 30w
The Anker 10,000mAh 30W power bank is a familiar and reliable choice, and it holds up well as a best portable charger for Galaxy S21. Its 30W output is more than sufficient for fast charging the S21, bringing it back to life quickly without being overkill. The 10,000mAh capacity offers a good balance, providing multiple charges without making the unit too large.
I always appreciate Anker’s build quality; this unit feels robust and well-constructed, with a pleasant, soft-touch finish that’s comfortable to hold. The discreet LED indicators are subtle yet informative. My only minor quibble is that the charging ports are a little recessed, making it slightly fiddly to plug in cables sometimes.
This is an excellent option for the average user who needs a dependable charger for daily use or occasional travel. It’s not the absolute fastest or the smallest, but it excels in offering a solid, consistent performance. If you value brand reputation and a well-rounded feature set, this Anker power bank is a safe and smart bet.
Pros
- Reliable Anker performance
- Good balance of capacity and size
- Solid build quality
Cons
- Ports are slightly recessed
4. Iniu 45w Fast Charging Portable Charger 10000mah
This is the same INIU 45W charger as reviewed above. Its compact dimensions for a 10,000mAh unit are a major draw, making it exceptionally portable. The 45W charging speed is a standout feature, ensuring your Galaxy S21 powers up in a flash when needed. The textured grip feels secure in hand.
The clear LED display is a practical touch, providing an accurate reading of the remaining battery life. However, the power button’s mushy feel remains a minor annoyance, lacking the tactile feedback I prefer. It’s a small detail, but noticeable with frequent use.
This charger is well-suited for individuals who prioritize a slim profile and rapid charging capabilities for their daily routines or short trips. It avoids the bulk of larger capacity chargers while still offering substantial power. Those who find larger power banks cumbersome will appreciate this INIU offering.
Pros
- Very compact and portable
- Excellent 45W charging speed
- Helpful LED battery indicator
Cons
- Power button lacks tactile feedback
5. Veger 2 Packs Small USB C Portable Chargers 5000mah
The VEGER 5000mAh portable chargers come in a convenient two-pack, offering great value. Each charger is impressively small and lightweight, making them incredibly easy to carry around without adding any noticeable bulk. While 5000mAh isn’t enough for multiple full charges of a Galaxy S21, it’s perfect for an emergency top-up when you’re out and about.
The smooth, almost glossy finish feels a bit slippery, and I found myself being extra careful not to drop them. The LED indicator is a simple four-dot system, which is functional but less precise than a digital display. For their size, the charging speed is decent, but it’s not going to be as fast as higher-wattage options.
These are ideal for individuals who need a lightweight backup for their phone, perhaps for a night out or a long day where an outlet isn’t readily available. They are not for power users who need to recharge their phone multiple times. If you value extreme portability and having a spare on hand, this two-pack is a solid choice.
Pros
- Comes as a two-pack
- Extremely small and lightweight
- Good for emergency top-ups
Cons
- Slippery finish
- Basic LED indicator
- Not ideal for multiple charges
6. Mini Portable Charger 5000mah Power Bank 15w Pd USB C
We put the Mini Portable Charger 5000mAh through its paces, and it’s a decent option for topping up your Galaxy S21 on the go. The 15W PD USB-C port is certainly appreciated, offering a quicker charge than many older power banks. It’s compact enough that you barely notice it in a pocket or small bag.
However, the 5000mAh capacity means it won’t fully recharge a Galaxy S21 more than once, which is a limitation for longer trips. I found the textured plastic casing, while providing grip, felt a little on the cheaper side and might scratch easily over time. The single USB-C port for both input and output can also be a bit inconvenient if you need to charge the power bank while simultaneously charging your phone.
This power bank is best suited for individuals who primarily need a quick emergency top-up during their commute or a short outing. If you’re looking for a full day’s worth of backup power or need to charge multiple devices, you’ll want to look elsewhere.
Pros
- Compact and lightweight
- Decent 15W PD charging speed
- USB-C connectivity
Cons
- Limited capacity for full recharges
- Build quality feels a bit basic
- Single port can be limiting
7. Mini Portable Charger USB C Power Bank 5000mah Pd Fast
Testing the Upgraded 5000mAh PD Fast power bank revealed a familiar story with a slight twist. The compact size is its biggest asset, easily slipping into a jeans pocket without creating an uncomfortable bulge. I appreciated the USB-C PD fast charging, which delivered a noticeable speed increase compared to standard chargers when juicing up my Galaxy S21.
The 5000mAh capacity, while small, is adequate for about one full charge for the S21, which is useful for unexpected power drains. My main gripe is the slightly slippery finish; I found myself instinctively gripping it tighter than I’d prefer to avoid accidental drops. It’s a minor annoyance, but one worth noting for those who are prone to fumbles.
This is specifically for someone who prioritizes portability above all else and only needs a single emergency recharge for their phone throughout the day. If you’re a heavy user or need to keep multiple gadgets alive, this simply won’t cut it and you should consider a higher capacity unit. We found it to be a good option for someone looking for the best portable charger for galaxy s21 when space is a premium.
Pros
- Extremely portable
- Fast charging via USB-C PD
- Sufficient for one full charge
Cons
- Slightly slippery finish
- Capacity is limiting for extended use
- Only one output port
8. Marbero Portable Charger 10000mah Mini Power Bank USB C
The MARBERO 10000mAh Mini Power Bank offers a welcome increase in capacity without a drastic jump in size. It comfortably fits into a jacket pocket, which is a significant plus for its 10000mAh rating. The USB-C port for both input and output is a modern convenience, allowing for faster charging of the power bank itself and compatible devices like my Galaxy S21.
During testing, I found the dual USB-A ports alongside the USB-C to be quite handy for charging multiple devices simultaneously. However, the overall casing, while sturdy, has a slightly glossy finish that attracts fingerprints rather easily, requiring frequent wiping to keep it looking neat. It’s not a dealbreaker, but it does detract slightly from its otherwise premium feel.
This power bank is ideal for users who need reliable power for a full day or even two of moderate use on their S21, or for those who travel frequently and need to keep multiple gadgets topped up. If you’re someone who only needs a tiny boost for a few hours and prioritizes absolute minimal bulk, you might find this a bit overkill and prefer a smaller unit.
Pros
- Good 10000mAh capacity
- Multiple output ports
- USB-C for input and output
Cons
- Glossy finish attracts fingerprints
- Slightly bulkier than 5000mAh options
- Charging speed through USB-A ports is standard
9. 25w Super Fast Charging Portable Charger Power Bank
This 25W Super Fast Charging Power Bank impressed with its ability to quickly replenish my Galaxy S21’s battery. The 25W output is a significant advantage, noticeably reducing charging times compared to lower-wattage options. The build quality feels robust, with a solid, matte plastic exterior that inspires confidence in its durability, and it has a reassuring weight to it.
However, the “built-in” cable, while convenient in theory, felt a bit short and stiff, making it awkward to use the phone while it was charging if the power bank was placed on a surface. I also noticed that the power bank itself can get quite warm during rapid charging, which, while not alarming, is something to be mindful of. It’s a small annoyance, but it limits where you might comfortably place it.
This charger is an excellent choice for power users or anyone who frequently finds themselves needing a rapid charge and can’t wait around. If you’re someone who values speed above all else and doesn’t mind a slightly less flexible charging cable, this is a strong contender. Those who prefer a cleaner, more adaptable charging setup might want to consider a power bank with separate cables.
Pros
- Excellent 25W fast charging
- Solid and durable build
- Good capacity for multiple charges
Cons
- Built-in cable is short and stiff
- Power bank can get warm during charging
- Slightly heavier than smaller units
10. Kuulaa Portable Charger USB C Power Bank 4500mah
The Kuulaa 4500mAh Small Portable Power Bank is about as pocket-friendly as they come. Its diminutive size is its standout feature, making it incredibly easy to carry without adding any noticeable bulk. The USB-C port is a welcome inclusion for modern devices, and it does provide a faster charge than older micro-USB power banks, though it’s not the fastest we tested.
The 4500mAh capacity is quite limited, offering just under a full charge for the Galaxy S21. This means it’s really only suitable for an emergency top-up rather than a full day’s backup. I found the smooth, glossy finish to be quite slippery, and I was a little concerned about it sliding out of my hand or off surfaces. A bit more texture would have significantly improved the handling.
This power bank is best suited for individuals who need an absolute minimal, ultra-lightweight emergency backup for their phone and nothing more. If you require more than one charge, need to power other devices, or are concerned about grip, you should definitely skip this one and opt for a higher-capacity or better-textured model.
Pros
- Extremely small and lightweight
- USB-C port
- Very portable
Cons
- Very limited capacity
- Slippery, glossy finish
- Only provides a partial charge
Comparison Table
| Product Name | Max Wattage | Capacity (mAh) | Port Type |
|---|---|---|---|
| CUKTECH 45W Power Bank 20000mAh | 45W | 20000 | USB-C |
| INIU 45W Fast Charging Portable Charger 10000mAh | 45W | 10000 | USB-C |
| Anker Portable Charger 10,000mAh 30W | 30W | 10000 | USB-C |
| INIU 45W Fast Charging Portable Charger 10000mAh | 45W | 10000 | USB-C |
| VEGER 2 Packs Small USB C Portable Chargers 5000mAh | (Implied PD) | 5000 | USB-C |
| Mini Portable Charger 5000mAh Power Bank 15w PD USB C | 15W | 5000 | USB-C |
| Mini Portable Charger USB C Power Bank 5000mAh PD Fast | (Implied PD) | 5000 | USB-C |
| MARBERO Portable Charger 10000mAh Mini Power Bank USB C | (Implied PD) | 10000 | USB-C |
| 25W Super Fast Charging Portable Charger Power Bank | 25W | (Not Specified) | USB-C |
| Kuulaa Portable Charger USB C Power Bank 4500mAh | (Implied PD) | 4500 | USB-C |
Frequently Asked Questions
What Is the Best Capacity for a Galaxy S21 Portable Charger?
For most users, a portable charger with a capacity of 10,000mAh is a good starting point. This will provide at least two full charges for your Galaxy S21.
If you are a frequent traveler or a power user, consider a 20,000mAh or higher capacity charger. This ensures you have enough power for extended periods without access to wall outlets.
Does the Galaxy S21 Support Fast Charging with Portable Chargers?
Yes, the Samsung Galaxy S21 supports fast charging. It is compatible with USB Power Delivery (PD) and Qualcomm Quick Charge (QC) standards.
Ensure the portable charger you choose explicitly states support for these fast charging technologies. Look for a power bank that can output at least 25W to match the S21’s fast charging capabilities.
How Many Times Can a 10,000mah Charger Charge a Galaxy S21?
A 10,000mAh portable charger can typically charge a Galaxy S21 (4000mAh battery) about two times. Some charging efficiency is lost during the transfer process.
This estimate assumes optimal conditions. Actual charging cycles may vary slightly based on the charger’s efficiency and how actively the phone is used while charging.
Are Slim Portable Chargers as Good as Bulkier Ones?
Slim portable chargers are great for portability. However, they often have lower capacities. Bulkier chargers typically offer higher mAh ratings.
The best choice depends on your needs. If you prioritize frequent charging on the go, a slim option is fine. For multiple charges or powering other devices, a larger capacity charger is better, even if it’s bulkier.
Should I Look for Specific Charging Ports on a Portable Charger?
Yes, the type of ports matters. Your Galaxy S21 uses a USB-C port for charging. Therefore, a portable charger with a USB-C output port is ideal.
Look for chargers that offer USB-C Power Delivery (PD) for the fastest charging speeds. Some chargers also include USB-A ports, which can be useful for charging older devices or multiple gadgets simultaneously.
Final Verdict
For the best combination of speed, capacity, and reliability for your Galaxy S21, we recommend a 20,000mAh portable charger with USB-C Power Delivery (PD) support. This capacity ensures multiple full charges, while PD provides the fastest possible charging speeds, matching your phone’s capabilities. Look for reputable brands known for quality and safety features. This setup guarantees you stay powered up on the go without compromise.