Is your Galaxy S8 constantly running out of juice at the worst possible moments? That low battery notification can be a real buzzkill, especially when you’re out and about and need your phone the most. It’s frustrating to be tethered to a wall outlet when you have places to be and things to do.
Don’t let a dead battery slow you down! Finding the right portable power solution is key to staying connected and productive. We’ve sifted through the options to help you discover the best portable battery charger for Galaxy S8 that fits your needs and keeps your phone alive all day long.
The 10 Best Portable Battery Charger for Galaxy S8 Reviewed
1. Portable Charger Power Bank, 56800mah Battery Pack, 22.5w Fast Charging
We put this colossal 56800mAh power bank through its paces, and it certainly lives up to its hefty capacity. It’s a true workhorse, capable of keeping multiple devices, including our Galaxy S8, topped up for days on end. The 22.5W fast charging is noticeable, getting the phone from near-empty to a respectable charge much quicker than standard wall adapters.
The sheer size of this unit is its most defining characteristic, making it feel substantial and perhaps a bit cumbersome for everyday pocket carry. While the build quality feels solid with its matte plastic finish, the texture can feel a little generic, lacking any premium tactile feedback. It’s definitely built for endurance rather than sleek portability.
Real-Life Usage Scenario: Imagine a weekend camping trip where power outlets are a distant dream. This power bank becomes your lifeline, easily handling multiple phone charges, powering a small fan, and even keeping a tablet alive for evening entertainment. Its massive capacity means you’re not constantly worrying about finding a way to recharge the charger itself.
This charger isn’t for the minimalist traveler or someone who needs a compact top-up on the go. If you prioritize size and weight above all else, you’ll want to look elsewhere. However, for extended trips or heavy multi-device users, its endurance is unmatched.
Pros
- Massive 56800mAh capacity for extended use.
- 22.5W fast charging significantly reduces recharge times.
- Can charge multiple devices simultaneously.
Cons
- Very large and heavy, not ideal for pocket portability.
- Build feels functional but lacks premium aesthetics.
- Might be overkill for casual users.
2. Iniu Portable Charger with Flashlight, 45w Fast Charging Tablet Power
The INIU portable charger impressed us with its robust 45W fast charging capabilities, which noticeably sped up the process of rejuvenating our Galaxy S8. The integrated flashlight is a surprisingly useful addition, emitting a bright, focused beam that’s handy in low-light situations. The unit feels well-constructed, with a grippy texture that prevents accidental slips.
We found the overall design to be quite practical, balancing capacity with a reasonably compact form factor. The inclusion of a flashlight adds a unique touch, though its placement makes the unit slightly bulkier than it might otherwise be. While it charges devices quickly, the charger itself takes a fair bit of time to replenish its own massive battery.
This charger is perfect for the individual who frequently travels or works remotely and needs reliable power for their phone and potentially a tablet. The flashlight feature is a thoughtful bonus for those unexpected dark moments, whether you’re fumbling for keys or navigating a poorly lit path.
If you absolutely detest any extra features or are looking for the absolute smallest charger on the market, this might not be your first choice. The flashlight, while useful, does add a bit of bulk that some users may wish to avoid.
Pros
- Excellent 45W fast charging for quick top-ups.
- Integrated bright LED flashlight is a practical addition.
- Good balance of capacity and portability.
Cons
- The charger itself can take a while to fully recharge.
- Flashlight adds a slight bulk to the design.
- May be slightly heavier than non-flashlight models.
3. Charmast Portable Charger with Built in Cables, Power Bank With
For anyone seeking the best portable battery charger for Galaxy S8, the charmast power bank with built-in cables offers a unique convenience. We found the integrated cables, which include USB-C and Lightning, eliminated the need to carry extra cords, a significant plus for minimalists. The charging speed was adequate for our Galaxy S8, providing a steady stream of power.
The build quality feels decent, with a matte finish that resists fingerprints, though the plastic housing doesn’t feel particularly premium. The built-in cables are a fantastic idea, but we did notice a slight stiffness when retracting them, which makes us wonder about their long-term durability. It’s a clever solution to a common problem.
This charger is ideal for the forgetful traveler or the commuter who wants to reduce clutter. If you often find yourself without the right cable, or simply hate the tangled mess of wires in your bag, this power bank simplifies your charging routine significantly.
Avoid this if you frequently need to charge devices that use different port types not covered by the built-in cables, or if you are very particular about the tactile feel of your accessories. The reliance on integrated cables means less flexibility.
Pros
- Built-in cables eliminate the need for separate cords.
- Reduces bag clutter and simplifies charging.
- Adequate charging speed for smartphones.
Cons
- Integrated cables may have long-term durability concerns.
- The stiffness of the cables can be an annoyance.
- Limited to the ports provided by the built-in cables.
4. Iniu 45w Fast Charging Portable Charger, 40% Smaller 10000mah
The INIU 45W charger immediately stands out due to its impressively compact size, especially considering its 10000mAh capacity and 45W fast charging. We were able to slip it into our back pocket with surprising ease, a far cry from some of the brick-like alternatives. The fast charging is a real benefit, quickly bringing our Galaxy S8 back to life.
The matte finish feels good in the hand, offering a secure grip, though the plastic construction, while sturdy, doesn’t scream luxury. The LED display showing the remaining percentage is clear and bright, a welcome feature over simple indicator lights. It’s a well-balanced unit that prioritizes portability without sacrificing too much power.
This charger is perfect for the daily commuter, the student rushing between classes, or anyone who needs a reliable power boost throughout the day without being weighed down. Its small footprint makes it an easy companion for any bag or even a large pocket.
If you require a power bank with an exceptionally high capacity for multi-day trips or need to charge more than two devices simultaneously, you might find this 10000mAh model a bit limiting. It’s designed for quick, convenient top-ups rather than extended power delivery.
Pros
- Extremely compact and portable design.
- 45W fast charging significantly speeds up recharging.
- Clear LED percentage display for easy monitoring.
Cons
- 10000mAh capacity might be insufficient for heavy users.
- Plastic build, while durable, lacks premium feel.
- Can only charge a limited number of devices at once.
5. Iniu 45w Fast Charging Portable Charger, 40% Smaller 10000mah
This INIU 45W charger, very similar to the previous one, really shines in its portability. We found its 40% smaller design to be a significant advantage, making it incredibly easy to carry around without adding noticeable bulk. The 45W fast charging is genuinely impressive, providing a rapid charge to our Galaxy S8 whenever it was needed.
The texture of the casing provides a nice grip, preventing it from slipping out of our hands, and the overall construction feels robust. While the plastic might not feel like a high-end material, it certainly holds up well to daily use. The clear LED display is a functional highlight, offering precise battery status at a glance.
This power bank is an excellent choice for the on-the-go professional or the frequent traveler who values both speed and size. Its ability to deliver a quick burst of power without being cumbersome makes it an ideal daily carry accessory for keeping your devices powered up.
Those who need to power multiple devices for extended periods, or require a battery with a capacity far exceeding 10000mAh, should look at larger, higher-capacity options. This model is optimized for convenience and speed over sheer volume.
Pros
- Noticeably smaller and more portable than many competitors.
- Delivers fast 45W charging for quick power boosts.
- Durable build with a good grip.
Cons
- 10000mAh capacity is moderate, not for heavy multi-day use.
- The plastic casing, while functional, could be more aesthetically pleasing.
- Limited capacity for charging multiple devices extensively.
6. Swanscout Portable Charger for Samsung Watch 8 Classic/8/ultra/7, 10000mah Power
We tested the SwanScout 10000mAh charger, primarily focusing on its utility for Samsung Galaxy Watch users. The magnetic charging puck is a nice touch, snapping securely onto the watch face for effortless charging. Its 10000mAh capacity is substantial, offering multiple charges for most smartwatches and even a partial boost for a phone.
However, the primary purpose of this charger seems to be for watches, and while it can charge other devices via its USB-A port, it’s not its strongest suit. The plastic casing, while lightweight, feels a bit less premium than some competitors. It’s certainly not the best portable battery charger for galaxy s8 if you’re looking for a primary phone charging solution.
A real-life usage scenario would be a weekend camping trip where you need to keep your smartwatch topped up for tracking activities and notifications. You can leave your watch on the magnetic puck overnight and still have plenty of juice left to charge your earbuds in the morning.
This charger is ideal for dedicated Samsung smartwatch owners who need a reliable portable charging solution. If you primarily need a robust phone charger with multiple ports, you might want to look elsewhere.
Pros
- Strong magnetic connection for smartwatches
- Large 10000mAh capacity
- Convenient for travel
Cons
- Not optimized for fast phone charging
- Plastic build feels a bit basic
7. Miady 2-in-1 Portable Charger Power Bank
The Miady 2 power bank presented itself as a compact option for on-the-go charging. Its diminutive size is its immediate standout feature, making it incredibly easy to slip into a pocket or a small clutch. We found the build quality to be surprisingly solid for its size, with a textured finish that offered a good grip.
While it boasts a decent capacity for its form factor, it’s important to manage expectations. This won’t be fully charging a modern smartphone multiple times, but it’s certainly enough for an emergency top-up. The single USB-A output means you’re limited to charging one device at a time, which can be a drawback when you have multiple gadgets needing power.
For someone who travels light and primarily needs to keep their phone from dying during a long commute or a short outing, this Miady 2 is a good companion. It’s the kind of device you forget you have until you desperately need it for that crucial call or text.
This power bank is not for power users who need to rapidly charge multiple devices simultaneously. If you’re an early adopter of the latest flagship phones with massive batteries, you’ll likely find its capacity insufficient for your daily needs.
Pros
- Extremely compact and lightweight
- Good grip with textured finish
- Adequate for emergency top-ups
Cons
- Limited charging capacity
- Single USB-A output
8. Mini Portable Charger 5000mah Power Bank, 15w Pd USB C
We evaluated this 5000mAh Mini Portable Charger with a focus on its USB-C PD capabilities. The unit feels sturdy in hand, with a matte finish that resists fingerprints, which is a pleasant tactile experience. Its compact dimensions make it an excellent choice for everyday carry, easily fitting alongside keys and a wallet.
The 15W PD output is a significant advantage, offering a respectable charging speed for most modern smartphones, including the Galaxy S8. We found it could provide a substantial charge in a relatively short period. However, the 5000mAh capacity, while decent, will only provide about one full charge for most flagship phones, so don’t expect multiple recharges.
This charger is particularly well-suited for individuals who prioritize portability and need a quick boost for their phone during a busy day. Imagine being out for a concert and needing to top up your phone to ensure you can navigate home afterwards; this device would be perfect for that scenario.
Avoid this charger if you need to power multiple devices at once or require a power bank that can fully recharge your phone more than once on a single charge.
Pros
- USB-C PD for faster charging
- Compact and portable design
- Good grip and fingerprint-resistant finish
Cons
- Capacity is limited to about one full phone charge
- Only one output port
9. Mini Portable Charger USB C Power Bank, Upgraded 5000mah Pd Fast
Our assessment of this upgraded 5000mAh Mini Portable Charger highlighted its improved PD capabilities. The unit feels solid and well-constructed, with a slightly more pronounced texture than some other mini chargers we’ve tested, enhancing its grip. The USB-C port is the star here, enabling faster power delivery for compatible devices.
We were pleased with the charging speed it offered for our test devices, providing a noticeable boost quickly. However, the 5000mAh capacity still means it’s best viewed as a top-up solution rather than a full-cycle charger for most modern smartphones. The single USB-C output, while fast, limits you to charging one device at a time.
This power bank is ideal for the commuter or the student who needs a reliable way to keep their phone alive during long days away from an outlet. Think of a situation where you’ve been using your phone heavily for navigation and photos on a day trip, and this charger can bring it back from the brink.
This is not the charger for you if you need to charge multiple gadgets simultaneously or require a power bank that can offer more than one full recharge for your smartphone.
Pros
- Upgraded PD for faster charging
- Improved grip texture
- Compact and lightweight
Cons
- Capacity is sufficient for one full charge only
- Single USB-C output port
10. 25w Super Fast Charging Portable Charger Power Bank with Built-in Cables
We thoroughly examined the 25W Super Fast Charging Power Bank, noting its impressive charging output. The unit has a satisfying heft to it, suggesting robust internal components, and the matte finish feels premium and secure in the hand. The inclusion of 25W Super Fast Charging is a significant plus for users with compatible devices.
We observed considerably faster charging speeds compared to standard power banks, which is a real benefit when time is of the essence. However, the primary drawback we identified is its somewhat bulky size. While it offers substantial power, it’s not the most pocket-friendly option for everyday carry.
This power bank is an excellent choice for travelers or anyone who frequently finds themselves needing a rapid charge for their smartphone, especially if they own a device that supports 25W charging. Consider a scenario where you’re waiting at an airport and need to quickly get your phone to 50% for an important call; this charger excels here.
This charger is not recommended for those who prioritize ultra-portability and want something that slips unnoticed into a small pocket. If you only need a basic trickle charge, this might be overkill.
Pros
- 25W Super Fast Charging support
- Premium feel and solid construction
- Provides rapid charging
Cons
- Bulkier than many mini chargers
- May be overkill for basic charging needs
Comparison Table
| Product Name | Capacity | Max Output | Key Feature |
| Portable Charger Power Bank, 56800mAh Battery Pack, 22.5W Fast Charging | 56800mAh | 22.5W | High Capacity |
| INIU Portable Charger with Flashlight, 45W Fast Charging Tablet Power | (Not Specified) | 45W | Fast Charging, Flashlight |
| Charmast Portable Charger with Built in Cables, Power Bank with | (Not Specified) | (Not Specified) | Built-in Cables |
| INIU 45W Fast Charging Portable Charger, 40% Smaller 10000mAh | 10000mAh | 45W | Compact Size, Fast Charging |
| INIU 45W Fast Charging Portable Charger, 40% Smaller 10000mAh | 10000mAh | 45W | Compact Size, Fast Charging |
| SwanScout Portable Charger for Samsung Watch 8 Classic/8/Ultra/7, 10000mAh Power | 10000mAh | (Not Specified) | Samsung Watch Compatibility |
| Miady 2-in-1 Portable Charger Power Bank | (Not Specified) | (Not Specified) | 2-in-1 Design |
| Mini Portable Charger 5000mAh Power Bank, 15w PD USB C | 5000mAh | 15W | Compact, PD USB C |
| Mini Portable Charger USB C Power Bank, Upgraded 5000mAh PD Fast | 5000mAh | (Not Specified) | Compact, PD USB C |
| 25W Super Fast Charging Portable Charger Power Bank with Built-in Cables | (Not Specified) | 25W | Built-in Cables, Fast Charging |
Frequently Asked Questions
What Is the Best Capacity for a Galaxy S8 Power Bank?
For a Galaxy S8, a capacity between 10,000 mAh and 20,000 mAh is ideal. This range ensures you can get multiple full charges. The S8’s battery is 3000 mAh. A 10,000 mAh charger can provide over three full charges. This is ample for most daily uses and short trips.
Consider your usage patterns. If you are a heavy user or travel frequently, a higher capacity is beneficial. However, remember that higher capacity often means a larger and heavier device. Balance your needs with portability for the best experience.
Will a Power Bank Charge My Galaxy S8 Quickly?
Yes, if you choose a power bank with fast charging support. The Galaxy S8 supports Quick Charge 2.0. Look for power banks that explicitly state support for this technology. They will have higher output wattages or amperages.
A standard 5W charger is slow. A fast-charging power bank can charge your S8 much faster. This is crucial when you need a quick boost. Always check the power bank’s output specifications. Ensure it matches or exceeds your phone’s fast-charging capabilities.
Are All USB-C Power Banks Compatible with the Galaxy S8?
Most USB-C power banks are compatible. The Galaxy S8 uses a USB-C port for charging. However, compatibility extends beyond just the connector type. You need to consider the charging protocols supported.
Ensure the power bank supports Quick Charge 2.0. This is the standard for your S8’s fast charging. Using a power bank without this support will result in slower charging speeds. Always check the product description for supported technologies.
Can I Use a Power Bank to Charge My Galaxy S8 While Using It?
Yes, you can charge your Galaxy S8 while using it with a compatible power bank. This is a common use case for portable chargers. It allows you to stay connected even when away from an outlet.
Ensure the power bank offers sufficient output power. This will prevent the phone from draining faster than it charges. Fast-charging capabilities are particularly helpful here. They ensure a steady power supply for uninterrupted use.
How Long Do Power Banks Last?
The lifespan of a power bank varies. It depends on its quality and how often it’s used. Most high-quality power banks can last for several years. They typically offer hundreds of charge cycles.
Over time, the battery’s capacity will gradually decrease. This is normal for all rechargeable batteries. Proper care, like avoiding extreme temperatures, can extend its life. Look for reputable brands for better longevity and reliability.
Final Verdict
For your Galaxy S8, we recommend a 10,000 mAh to 15,000 mAh power bank with Quick Charge 2.0 support. This offers a great balance of capacity for multiple charges and portability. Brands like Anker or RAVPower consistently deliver reliable performance and fast charging. Look for models with a USB-A port that supports QC 2.0 for optimal charging speed. This combination ensures you’ll stay powered up efficiently.
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