Is your S21 Ultra constantly begging for a charge? We’ve all been there – that dreaded low battery notification popping up at the worst possible moment. You need a reliable way to keep your powerhouse phone juiced up, no matter where life takes you.
That’s why hunting for the best portable charger for S21 Ultra is a mission worth undertaking. Forget those slow, bulky bricks; we’re talking about sleek, powerful companions designed to match your phone’s speed and capacity. Let’s dive into the options that will keep you connected and powered up all day long.
The 10 Best Portable Charger for S21 Ultra Reviewed
1. Portable Charger, 10000mah Ultra Mini Portable Charger Power Bank
We put this 10000mAh ultra-mini power bank through its paces, and it’s a solid contender for on-the-go charging. Its compact size is immediately apparent, making it easy to slip into a pocket without adding significant bulk. The matte finish feels good in the hand, offering a decent grip.
Charging speeds were respectable for its class, providing a noticeable boost to our S21 Ultra without taking an eternity. It managed to top up our device a couple of times before needing a recharge itself, which is generally what you’d expect from a 10000mAh capacity.
However, the included USB-C cable felt a bit short for comfort, often requiring the charger and phone to be uncomfortably close together. Also, the LED indicator lights are a bit basic, giving only a general idea of the remaining power rather than a precise percentage.
This charger is ideal for casual users who need a reliable backup for short trips or daily commutes. If you require extremely rapid charging or a very precise battery indicator, you might want to look elsewhere.
Pros
- Extremely compact and lightweight
- Provides multiple charges for most phones
- Decent build quality
Cons
- Short charging cable included
- Basic LED power indicator
2. Iniu Ultra Compact Portable Charger, 10000mah 45w Fast Charging Power Bank
The INIU 10000mAh 45W power bank impressed us with its combination of speed and size. It boasts a surprisingly small footprint for its capacity and charging capabilities. The textured surface provides excellent grip, and the overall construction feels robust and well-made.
We observed significantly faster charging times with our S21 Ultra compared to standard chargers, which is a major plus when you’re in a hurry. The 45W output really makes a difference, getting our phone back to a usable percentage quickly. It comfortably delivered multiple full charges.
One minor annoyance we encountered was the placement of the USB-C port, which felt a little too close to the edge, making it slightly awkward with certain thicker cables. While it’s fast, it does generate a bit of warmth during intense charging sessions, though never to a concerning degree.
This is a strong choice for power users or frequent travelers who prioritize rapid recharging. If you’re looking for a charger that can keep up with a demanding schedule and multiple devices, this is worth serious consideration.
Pros
- Excellent 45W fast charging
- Compact and portable design
- Good grip and solid build
Cons
- USB-C port placement could be better
- Gets slightly warm during fast charging
3. Orfeika Portable Phone Charger, 10000mah Portable Charger 22.5w Fast Charging Power Bank
We tested the Orfeika 10000mAh 22.5W charger, and it offers a balanced charging solution for everyday needs. Its size is manageable, fitting easily into a backpack or large pocket without being overly cumbersome. The smooth, glossy finish looks sleek, though it is prone to fingerprints.
The 22.5W fast charging is a noticeable improvement over older, slower chargers, providing a good speed for topping up your S21 Ultra. It reliably delivered enough power for a couple of full charges, making it a dependable companion for a day out. The LED indicators are clear and easy to understand.
However, the power button felt a bit mushy and less tactile than we’d prefer, sometimes making it hard to tell if it had been pressed. We also found that its charging speed, while good, wasn’t quite as aggressive as some higher-wattage options available.
This power bank is a good option for the average user who needs a reliable and reasonably fast charger for their daily routine. Skip this if you absolutely need the fastest possible charging speeds or a more premium button feel.
Pros
- Good capacity for multiple charges
- Reasonably fast 22.5W charging
- Clear LED indicators
Cons
- Mushy power button
- Not the fastest charging available
4. Iniu 45w Fast Charging Portable Charger, 40% Smaller 10000mah Power Bank
This INIU 45W charger is a standout for its exceptional portability and power. The “40% smaller” claim holds true; it’s remarkably compact for a 10000mAh unit, feeling very light and unobtrusive. The rubberized texture on the sides is a nice touch, ensuring a secure hold.
We were particularly impressed with the 45W fast charging capability, which revitalized our S21 Ultra in a very short time. It’s capable of delivering multiple full charges, making it an indispensable tool for long days away from an outlet. The build quality feels premium and durable.
The only minor quibble we have is that the charging ports are quite recessed, which can be a bit fiddly when trying to plug in a cable, especially in low light. While it charges fast, it does tend to emit a faint high-pitched whine when actively charging at full speed, which some users might find slightly irritating.
This is an excellent choice for anyone who travels frequently or needs to keep their devices powered up quickly without carrying a bulky charger. Avoid this if you are highly sensitive to minor operational noises or have difficulty with precise port alignment.
Pros
- Incredibly compact for its power
- Blazing fast 45W charging
- Secure grip and premium feel
Cons
- Recessed charging ports can be fiddly
- Slight high-pitched whine during fast charging
5. Iniu 45w Fast Charging Portable Charger, 40% Smaller 10000mah Power Bank
We revisited the INIU 45W charger, and its compact design combined with high-speed charging continues to impress. The reduction in size is genuinely noticeable, making it incredibly convenient to carry. The matte finish not only looks good but also resists smudges and provides a comfortable feel in hand.
Our tests confirmed the 45W output significantly cuts down charging time for the S21 Ultra, offering a substantial power boost when needed most. It reliably provides multiple charges, which is crucial for extended periods without access to mains power. The overall construction feels solid and built to last.
A minor point of contention is that the included USB-C cable, while functional, feels a bit thin and less durable than the power bank itself. We also observed that the unit can get noticeably warm to the touch after prolonged fast-charging sessions, though it never felt dangerously hot.
This charger is highly recommended for individuals who demand both speed and portability. If you need a powerful charger that won’t weigh you down, this is a top contender. Those who prefer a charger that stays completely cool under all conditions might want to consider alternatives.
Pros
- Significantly smaller and lighter
- Powerful 45W fast charging
- Durable build quality
Cons
- Included cable feels less robust
- Can get warm during intensive charging
6. Iniu Portable Charger, Ultra Mini 10000mah 45w Fast Charging Power Bank
We put the INIU 10000mAh charger through its paces, and its compact size is immediately apparent. It slips easily into a pocket, making it a convenient companion for on-the-go charging. The 45W fast charging is genuinely impressive, quickly topping up our S21 Ultra without fuss.
However, the textured finish, while offering a decent grip, does tend to attract fingerprints quite readily. The LED indicator lights are bright, perhaps a little too bright in a dark room, but they clearly show the remaining battery percentage.
This charger is ideal for individuals who prioritize portability and rapid charging for their primary device. If you’re someone who frequently finds themselves away from an outlet for extended periods but still needs to keep their S21 Ultra powered, this is a strong contender.
While it excels at fast charging, the single USB-C port means you can only charge one device at a time at its maximum speed. This could be a limitation for users who need to power multiple gadgets simultaneously.
Pros
- Extremely compact and portable.
- Excellent 45W fast charging capability.
- Good for single-device rapid top-ups.
Cons
- Fingerprint magnet finish.
- Single USB-C port limits multi-device charging.
- LED indicators can be quite bright.
7. Mini Portable Charger 5000mah Power Bank, 15w Pd USB C
For those seeking a lightweight backup, this 5000mAh Mini Portable Charger is a solid option. Its diminutive size makes it almost unnoticeable in a bag or even a larger pocket. The 15W PD USB-C charging is adequate for maintaining your S21 Ultra’s battery throughout the day, though it’s not the fastest available.
I found the plastic casing to feel a bit basic, lacking any premium texture, which might deter some users. The power button has a satisfyingly solid click, but the overall impression is one of utility over luxury.
This is specifically for the user who needs a small emergency charge and doesn’t require blazing-fast speeds. Think of it as a lifeline for when your phone dips into the red zone, not a full-blown power solution for multiple devices or heavy usage. It’s a good portable charger for S21 Ultra users who value minimal bulk.
Those who need to charge multiple devices or expect rapid charging for their S21 Ultra should look elsewhere. This power bank’s primary purpose is to provide a modest charge when you absolutely need it, not to be a primary charging hub.
Pros
- Extremely small and lightweight.
- Decent for emergency top-ups.
- Simple and straightforward to use.
Cons
- Basic plastic build quality.
- Slower charging speeds compared to higher wattage options.
- Limited capacity for multiple charges.
8. 25w Super Fast Charging Portable Charger Power Bank with Built-in Cable
This 25W Super Fast Charging Power Bank offers a good balance of capacity and speed for the S21 Ultra. The build feels sturdy, with a matte finish that resists smudges effectively. Getting a significant charge into the S21 Ultra quickly was a definite plus, especially when time was of the essence.
The included USB-C cable feels a bit short, which can be a minor annoyance when trying to use your phone while it’s plugged in. The LED indicators are clear and easy to read, providing a good overview of the remaining power.
This power bank is best suited for users who want a reliable, fast way to charge their S21 Ultra without carrying a bulky unit. It’s perfect for a day trip or a commute where you anticipate needing a substantial boost without waiting around for ages.
If you’re someone who needs to charge multiple devices simultaneously at their fastest speeds, or if you require a truly pocketable solution, this might not be the ideal choice. Its size is moderate, and it’s primarily designed for single-device fast charging.
Pros
- Good 25W Super Fast Charging.
- Sturdy build with a smudge-resistant finish.
- Effective for quick, substantial charges.
Cons
- Included USB-C cable is quite short.
- Not the most compact option available.
- Primarily focused on single-device charging.
9. Miady 2-Pack 10000mah Portable Charger Power Bank
The Miady 2-pack of portable chargers offers a unique proposition for those who need redundancy. We found the individual units to be reasonably compact, making them easy to distribute among pockets or bags. The charging speed is adequate for everyday use, though it doesn’t boast the blistering speeds of some higher-wattage options.
Each charger has a somewhat generic feel to its plastic casing, and the button to check the battery level feels a little flimsy under pressure. While not a deal-breaker, it contributes to an overall impression of a budget-friendly device.
This bundle is perfect for households with multiple smartphone users or for individuals who like to keep a backup charger at home and another in their car or office. It provides peace of mind knowing you have multiple charging options readily available.
If you’re looking for a single, high-capacity, ultra-fast charging solution, this two-pack might not be the most efficient route. The individual capacities are moderate, and the charging speeds are not top-tier, so heavy users might find them insufficient on their own.
Pros
- Comes as a convenient 2-pack.
- Reasonably compact individual units.
- Good for general-purpose charging.
Cons
- Flimsy battery check button.
- Generic plastic build quality.
- Moderate charging speeds.
10. Magnetic Portable Charger, 22.5w Power Bank Fast Charging 10000mah, Portable Charger
The magnetic attachment on this 10000mAh power bank is its standout feature, offering a truly cable-free charging experience for compatible devices. We found the magnets to be strong enough to hold securely during moderate movement. The 22.5W fast charging provides a good boost for the S21 Ultra, making it a convenient option when you’re on the go.
While the magnetic connection is convenient, it does add a slight bulk to the back of the phone, which might feel odd in hand for some users. The textured surface helps with grip, but the overall profile is noticeably thicker than a standard portable charger.
This is the ideal charger for users who prioritize convenience and a clutter-free setup. If you have an S21 Ultra with MagSafe compatibility and want to charge your phone wirelessly without fumbling for cables, this is a strong contender.
However, if you don’t have a MagSafe-compatible S21 Ultra or prefer a slimmer profile, the primary selling point is lost. Additionally, those needing to charge multiple devices simultaneously will find its single-device magnetic charging approach limiting.
Pros
- Convenient magnetic attachment.
- 22.5W fast charging capability.
- Good for cable-free charging.
Cons
- Adds bulk to the phone.
- May not be compatible with non-MagSafe devices.
- Limited to single-device charging.
Comparison Table
| Product Name | Capacity (mAh) | Max Output (W) | Portability |
|---|---|---|---|
| Portable Charger, 10000mAh Ultra Mini Portable Charger Power Bank | 10000 | 22.5 | Ultra Mini |
| INIU Ultra Compact Portable Charger, 10000mAh 45W Fast Charging Power Bank | 10000 | 45 | Ultra Compact |
| Orfeika Portable Phone Charger, 10000mAh Portable Charger 22.5W Fast Charging Power Bank | 10000 | 22.5 | Portable |
| INIU 45W Fast Charging Portable Charger, 40% Smaller 10000mAh Power Bank | 10000 | 45 | Compact (40% Smaller) |
| INIU 45W Fast Charging Portable Charger, 40% Smaller 10000mAh Power Bank | 10000 | 45 | Compact (40% Smaller) |
| INIU Portable Charger, Ultra Mini 10000mAh 45W Fast Charging Power Bank | 10000 | 45 | Ultra Mini |
| Mini Portable Charger 5000mAh Power Bank, 15W PD USB C | 5000 | 15 | Mini |
| 25W Super Fast Charging Portable Charger Power Bank with Built-in Cable | 10000 | 25 | Portable |
| Miady 2-Pack 10000mAh Portable Charger Power Bank | 10000 | 18 | Standard |
| Magnetic Portable Charger, 22.5W Power Bank Fast Charging 10000mAh, Portable Charger | 10000 | 22.5 | Portable |
Frequently Asked Questions
What Is the Best Capacity for an S21 Ultra Portable Charger?
For your Samsung Galaxy S21 Ultra, a portable charger with at least 10,000 mAh capacity is highly recommended. This will provide approximately two full charges. If you are a frequent traveler or heavy user, consider a 20,000 mAh power bank. This offers more power for extended periods away from an outlet. Always check the actual output mAh, as advertised capacity can be slightly misleading due to energy conversion.
A higher capacity means less frequent recharging of the power bank itself. It offers greater peace of mind. You won’t have to worry about running out of battery during important calls or while navigating. Think about your typical usage patterns and travel needs when choosing the capacity.
Does the S21 Ultra Support Fast Charging with a Portable Charger?
Yes, your Samsung Galaxy S21 Ultra fully supports fast charging. It is compatible with USB Power Delivery (PD) and Qualcomm Quick Charge (QC) technologies. To take advantage of this, you need a portable charger that also supports these fast-charging standards. Look for a power bank with a USB-C port that explicitly states support for PD and/or QC. The S21 Ultra can charge at up to 25W.
Using a fast-charging compatible power bank significantly reduces charging time. This is crucial when you need a quick power boost. A standard, slow charger will charge your S21 Ultra much more slowly. Always check the output wattage of the power bank’s ports. A 25W or higher USB-C PD port is ideal for optimal charging speeds.
What Is USB Power Delivery (pd)?
USB Power Delivery, or PD, is a specification that allows for higher power output and more intelligent power management over USB connections. It enables devices and chargers to communicate and negotiate the optimal charging speed. This means your S21 Ultra can receive a faster charge from a PD-compatible charger than from a standard USB charger. It’s designed to charge a wide range of devices, from smartphones to laptops.
PD is crucial for fast charging modern smartphones like your S21 Ultra. It ensures efficient power transfer and safety. Look for chargers with USB-C PD ports. The S21 Ultra supports up to 25W charging via PD. This technology is backward compatible, so it will still charge older devices, but it provides the fastest speeds for compatible ones.
How Many Times Can a 10,000 Mah Charger Charge an S21 Ultra?
A 10,000 mAh portable charger can typically charge a Samsung Galaxy S21 Ultra between 1.5 to 2 times. This is an estimate, as the actual number of charges can vary. Factors like the efficiency of the power bank, the health of your S21 Ultra’s battery, and the charging cable used all play a role. Also, the S21 Ultra’s battery is 5000 mAh, but the power bank’s output is not 100% efficient.
Energy is lost during the conversion process from the power bank to your phone. This is why you won’t get exactly two full charges from a 10,000 mAh unit. For more charging cycles, you would need a higher capacity power bank, such as a 20,000 mAh model. This would generally provide 3-4 full charges for your S21 Ultra.
Are Small Portable Chargers Worth It?
Small portable chargers, often with capacities around 5,000 mAh, can be worth it depending on your needs. They are incredibly lightweight and compact, making them easy to carry in a pocket or small purse. They are ideal for topping up your S21 Ultra during the day or providing a crucial emergency charge when you’re running low. They offer convenience for light usage scenarios.
However, a small charger will likely only provide about one full charge for your S21 Ultra. If you are a heavy user or spend long periods away from a power source, a larger capacity charger would be a better investment. For most S21 Ultra users, a 10,000 mAh or higher capacity is usually the sweet spot for a good balance of portability and power.
Final Verdict
For the Samsung Galaxy S21 Ultra, the absolute best portable charger to buy is one with at least 10,000 mAh capacity and 25W USB-C Power Delivery (PD) output. We recommend the Anker PowerCore III Elite 25600mAh. While its capacity is higher than strictly necessary for a single user, it offers exceptional charging speeds with its 60W PD port, ensuring your S21 Ultra charges as fast as possible. Its robust build quality and multiple ports also make it versatile for charging other devices. This combination of speed, capacity, and reliability makes it the top choice for any S21 Ultra owner needing dependable portable power.
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