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Add to your order
- Coverage for accidental damage including drops, spills, and broken parts, as well as breakdowns (plans vary)
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- Quick, easy, and frustration-free claims.
Prime Member Price
$29.99$29.99
Ships from: Amazon Sold by: Chen Ying Ke Ji
Regular Price
$45.99$45.99
Ships from: Amazon Sold by: Chen Ying Ke Ji
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Charmast Portable Charger with Built-in Cables and Wall Plug, 20000mAh 20W USB C Power Bank Fast Charging Battery Pack Compatible with iPhone iPhone 16/15/14/13 Series, Samsung Google iPad etc
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Return this item for free
We offer easy, convenient returns with at least one free return option: no shipping charges. All returns must comply with our returns policy.
Learn more about free returns.- Go to your orders and start the return
- Select your preferred free shipping option
- Drop off and leave!
Return this item for free
We offer easy, convenient returns with at least one free return option: no shipping charges. All returns must comply with our returns policy.
Learn more about free returns.- Go to your orders and start the return
- Select your preferred free shipping option
- Drop off and leave!
Connector Type | USB Type C |
Brand | Charmast |
Battery Capacity | 20000 Milliamp Hours |
Color | Black |
Special Feature | 20W Fast Chargin, Digital Display, Built In Wall Plug, Over Charging Protection, Built In Cable |
About this item
- Portable Charger with Built-in Cables and Wall Plug: Two cords and wall plugs integrated allows the Charmast power bank to be compatible with all cellphones, so you don't need to bring extra chargers or get frustrated with a tangled mess of wires.
- High-speed Charging: Equipped with 20W PD and 18W QC 3.0 fast charging, power up for your iPhone 13 from 20% to 70%, Samsung S21 from 20% to 60% in half an hour—that’s 3x faster compared to an original 5W charger.
- 20000mAh Capacity: 20000mAh battery capacity provides 3.75 charges for iPhone 14 Pro Max, 3.87 charges for iPhone 13, 4.26 charges for iPhone 12, 1.55 Charges for iPad 10th generation, 2.4 charges for your Samsung Galaxy s22 ultra, 4.33 charges for your Google Pixel, One Plus 11 2.4 charges.
- Compact Battery Pack: The weight of this power bank is around 12.99 ounces, which is just a bit heavy, but the weight matches the huge juice, fast charging, and broad compatibility. Thanks to an advanced slim profile that makes for a comfortable grip, the fully rubberized cover lets you enjoy a nice touch and protects your device from scratches or drops.
- What You Get: 20000mAh power bank *1, user manual*1, mesh pouch*1, our 24-month support, and 7-day/24-h friendly customer service. If you have any problems, please contact us and we will solve them within 24 hrs.
Additional Details


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- Sustainability features for this product
Sustainability features
This product has sustainability features recognized by trusted certifications.Carbon impactCarbon emissions from the lifecycle of this product were measured, reduced and offset.As certified byThe ClimatePartner certified product label confirms that a product meets the requirements for the five steps in climate action including calculating carbon footprints, setting reduction targets, implementing reductions, financing climate projects and communicating transparently to continuously reduce emissions.Certification Number1VBSIU - Sustainability features for this product
Sustainability features
This product has sustainability features recognized by trusted certifications.Carbon impactCarbon emissions from the lifecycle of this product were measured, reduced and offset.As certified byClimatePartner certified
The ClimatePartner certified product label confirms that a product meets the requirements for the five steps in climate action including calculating carbon footprints, setting reduction targets, implementing reductions, financing climate projects and communicating transparently to continuously reduce emissions.Certification Number743M8T - Sustainability features for this product
Sustainability features
This product has sustainability features recognized by trusted certifications.Carbon impactCarbon emissions from the lifecycle of this product were measured, reduced and offset.As certified byClimatePartner certified
The ClimatePartner certified product label confirms that a product meets the requirements for the five steps in climate action including calculating carbon footprints, setting reduction targets, implementing reductions, financing climate projects and communicating transparently to continuously reduce emissions.Certification Number446EHG - Sustainability features for this product
Sustainability features
This product has sustainability features recognized by trusted certifications.Manufacturing practicesManufactured using processes that reduce the risk of negative environmental impact.As certified byECOLOGO
ECOLOGO certified products have reduced environmental impacts at one or more stages of their lifecycle – from raw materials to end of life. ECOLOGO certification indicates that a product has met environmental performance standards, which include criteria in some or all of the following categories: materials, energy, manufacturing and operations, health and environment, product performance and use, and product stewardship and innovation. Products are evaluated on the applicable criteria through testing and auditing.
What's in the box
Videos
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1:45
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Watch before you buy this Charmast Portable ChargerSophie Robinson
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3:07
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Customer Review: great product and arrived quicklyJennifer Jones
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0:26
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Honest review of the Charmast Portable ChargerMaria
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0:31
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Is Charmast Portable Charger Worth It?The Daily With Katie
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2:09
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Honest review of power bank, great for people on the goChristine Cawood
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1:11
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Strongest travel battery I have found!Kristin Giefer
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1:58
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Charmast 20000mAh Power Bank with Built In Cables DemoBig-C
Product Description


Power Up Your iPhone 15 from 20% to 70% in Just 30 Minutes.

Built in Cable for iPhone, USB C Cable, Micro USB Cable for All Devices

Compatible with iPhone, Samsung, iPad, All Cellphones

Say Goodbye to Tangled Wires and Multiple Chargers

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How can I get the best solution if I have a problem with my product?
You can find us on your manual or through your order.
You will get satisfactory compensation if there are any technical problems with our power bank no matter whether the return window is closed or not. We will solve your problem within 24 hours.
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Getting hot when charging, is it normal?
Yes. It does get a little bit warm when both fast charging and fast discharging. Please feel free to use it since this power bank has built-in over-heat protection.
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What's the biggest disadvantage of this power bank?
The biggest disadvantage of this power bank is the weight of this power bank is around 12.99 ounces, which is just a bit heavy, but the weight matches the huge juice, fast charging, built-in cables, and wall plug, and broad compatibility.
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What is the real capacity of this power bank?
It has 20,000mah but it ends up providing less than 20,000mah to your device because it loses energy when discharged, which is common for power bank.
Product information
Product Dimensions | 5.91 x 2.83 x 1.09 inches |
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Item Weight | 13 ounces |
ASIN | B0BR9YVZNX |
Item model number | C2046S |
Batteries | 2 Lithium Polymer batteries required. (included) |
Customer Reviews |
4.2 out of 5 stars |
Best Sellers Rank | #3,758 in Cell Phones & Accessories (See Top 100 in Cell Phones & Accessories) #208 in Cell Phone Portable Power Banks |
Special features | 20W Fast Chargin, Digital Display, Built In Wall Plug, Over Charging Protection, Built In Cable |
Other display features | Wireless |
Color | Black |
Whats in the box | User Manual, Mesh Pouch, 20W Portable Charger with Built-in Cables *1 |
Manufacturer | Dong guan Utopia-Originality Technology Co., Ltd |
Date First Available | December 29, 2022 |
Warranty & Support
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Charmast Portable Charger with Built-in Cables and Wall Plug, 20000mAh 20W USB C Power Bank Fast Charging Battery Pack Compatible with iPhone iPhone 16/15/14/13 Series, Samsung Google iPad etc
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From the brand

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Charmast focuses on the portable charger, you can find us all over the world.
We want to keep your phone on at all times and bring you a safer, more powerful power bank.
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What problem are we solving?
Charmast is dedicated to solving the problem of customers' battery anxiety caused by insufficient battery life, whether they're on the go or using their devices daily.
Why do we love what we do?
We felt immensely proud when a recent customer told us that they had been using our product for five years without any issues.
What makes our products unique?
Charmast invites a range of portable chargers with built-in data cables, as well as compact chargers that can be directly plugged into phones for charging, set Charmast apart and make our products truly unique.
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Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers appreciate the power bank's built-in cords, battery capacity that holds a very long charge, and find it convenient to use. The charging speed and functionality receive mixed feedback - while some say it charges devices quickly and works well, others report it doesn't work with iPhones. Durability is also mixed, with some saying it lasts a long time while others report it breaking after 10 charges and 6 months. The weight receives mixed opinions, with some finding it easy to carry around while others consider it too bulky for small backpacks. Value for money opinions are divided between those who find it worth the purchase and those who consider it a waste of money.
AI-generated from the text of customer reviews
Customers appreciate that the power bank comes with built-in cables, eliminating the need for additional cords.
"...It will charge my phone several times, and it is fast. I love the built in cords, I don't have to worry about getting the right cord to charge..." Read more
"...The built-in USB C cables and wall plug are game-changers, eliminating the need to carry extra chargers, which makes it super convenient for..." Read more
"...It plugs directly into an outlet to charge. It has two cables attached to it so you don’t have to worry about losing them...." Read more
"...Cords are built in so never an issue with mine. It’s a great deal. I charge it about every two weeks and use it almost daily at work...." Read more
Customers find the power bank convenient and handy, with one mentioning it's easy to use once fully charged and another noting it's simple to plug into an outlet.
"...It’s solid, looks and feels nice and is just so convenient and powerful. I really do love this battery pack." Read more
"...- plugs into a wall outlet for charging - this is great for non-technical users who don't know (and don't want to know) the difference between USB..." Read more
"Easy to use. Doesn’t charge the phone super fast but it’s good enough." Read more
"...It's a handy little device!" Read more
Customers appreciate the power bank's battery life, noting that it holds a very long charge and doesn't run down, with one customer highlighting its 20000mAh capacity.
"...The 20000mAh capacity is phenomenal too; it easily gives multiple charges to my devices, like around 4 charges for my iPhone 12, which is fantastic..." Read more
"...One more plus: The outside of the charger gives a numerical reading of current charge percentage. Useful!" Read more
"...USB-A, USB-C, MicroB, Lightning, etc. - clear indication of how much juice is left The not so good:..." Read more
"...part is that it plugs right into the wall to charge and you can see the percentage so you know when it's fully charged." Read more
Customers have mixed experiences with the power bank's charging speed, with some reporting that it charges phones overnight and devices quickly, while others mention issues with devices not charging at all or only reaching 45% capacity.
"I love this charger. I like that I can plug it into any outlet to charge. (11 hours to charge) For faster charging, plug it into a 9V charger...." Read more
"...They take a really long time to charge. I do not recommend this larger version. ***..." Read more
"...The 20000mAh capacity is phenomenal too; it easily gives multiple charges to my devices, like around 4 charges for my iPhone 12, which is fantastic..." Read more
"...Charges devices quickly! My daughter took one to Miami for a 3 day trip. She fully charged it before she left...." Read more
Customers have mixed experiences with the power bank's functionality, with some reporting it worked well and was perfect, while others mention it stopped working after some time and doesn't work with iPhones.
"...would be fine except that she about two weeks, the wall plug in feature stopped working on both...." Read more
"Works well!" Read more
"I ordered this charger and it stopped working after 2 months. When the company found out, they refunded me entirely. THIS is great customer service!" Read more
"These worked great went the electric went due to a storm i purchased 2. Chargers quickly." Read more
Customers have mixed opinions about the power bank's weight, with some finding it perfect for travel and daily use while others note it's too bulky for small backpacks.
"...charger is a bit on the heavier side at 12.99 ounces, but the weight is justified considering the massive capacity and performance...." Read more
"...It is a bit heavy, but worth it for how usable it is. I have only had it since January, but it is my go-to charger when I travel." Read more
"...It goes with me when I travel and that's invaluable for long travel days. I have the same model in black as well." Read more
"This is the best charger I have purchased. It is flat and easy to throw in my purse and has cords that fit all of my portable electronics - very..." Read more
Customers have mixed experiences with the power bank's durability, with some reporting it lasts a long time and holds a charge well, while others mention it breaks within a year and isn't well made.
"Charges really quick but your phone looses that same charge just as quickly...." Read more
"...I charge it about every two weeks and use it almost daily at work. It’s solid, looks and feels nice and is just so convenient and powerful...." Read more
"...This lack of reliability and customer service is unacceptable...." Read more
"...30 day warranty is up and now I’m stuck with a broken product" Read more
Customers have mixed opinions about the power bank's value for money, with some finding it a great deal while others consider it a big waste of money.
"...It is a bit heavy, but worth it for how usable it is. I have only had it since January, but it is my go-to charger when I travel." Read more
"...Cords are built in so never an issue with mine. It’s a great deal. I charge it about every two weeks and use it almost daily at work...." Read more
"...Will not charge my iphone anymore, very frustrating, waste of money. They only offer 30 day return and then no warranty." Read more
"...I think this is well worth the money spent and will order others for gifts." Read more
Reviews with images

Broken in less than a year... BUT
Top reviews from the United States
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- Reviewed in the United States on March 21, 2025Color: CyanVerified PurchaseI love this charger. I like that I can plug it into any outlet to charge. (11 hours to charge) For faster charging, plug it into a 9V charger. It will charge my phone several times, and it is fast. I love the built in cords, I don't have to worry about getting the right cord to charge something. It is a bit heavy, but worth it for how usable it is. I have only had it since January, but it is my go-to charger when I travel.
- Reviewed in the United States on October 16, 2024Color: BlackVerified PurchaseI've been using the Charmast 20000mAh Portable Charger for a couple of weeks now, and overall, I'm pretty impressed! The built-in USB C cables and wall plug are game-changers, eliminating the need to carry extra chargers, which makes it super convenient for traveling. No more tangled mess of wires!
What really stands out is the fast charging capability. I can charge my iPhone 12 from 20% to 70% in about 30 minutes—talk about quick power-ups! The 20000mAh capacity is phenomenal too; it easily gives multiple charges to my devices, like around 4 charges for my iPhone 12, which is fantastic during long trips.
The charger is a bit on the heavier side at 12.99 ounces, but the weight is justified considering the massive capacity and performance. Plus, the sleek, rubberized design feels great to hold and offers decent protection against slips.
This little powerhouse has become an essential part of my day-to-day life, and I highly recommend it for anyone in need of a reliable portable charger!
What’s nice is that it comes with a user manual, a mesh pouch, and exceptional customer service—so you know you’re well taken care of. Great job, Charmast!
- Reviewed in the United States on May 13, 2024Color: BlackVerified PurchaseWe have purchased three of these. They are amazing! It plugs directly into an outlet to charge. It has two cables attached to it so you don’t have to worry about losing them. One cable is a iPhone lightning pin and the other one has USBC and micro usb. Charges devices quickly! My daughter took one to Miami for a 3 day trip. She fully charged it before she left. Her and her two friends used it all weekend and the day they flew home it STILL had power! She plugged in in to fully charge just in case their flight was delayed. It’s compact enough to fit in backpack, pocketbook, fanny pack etc. it is a little heavy but with the power it packs it’s worth it! I was hospitalized a few times and brought mine with me and didn’t have to bring any cables or outlet brick. There are built in prongs on it to plug it in. It takes a while to charge but it packs slot of power!
- Reviewed in the United States on January 19, 2025Color: CyanVerified PurchaseI have bought multiples of this charger in the 10000 mpw version for myself and as gifts and the all work perfectly. I was excited to see that it came in a 20000 version, so I purchased two. They are twice as heavy and thick as the 10000 version, which would be fine except that she about two weeks, the wall plug in feature stopped working on both. This is what makes these chargers so unique- that you don't need a separate cord to plug them into the wall. I tried to start a return, but the company made it too difficult. Now I have to use a separate cord to charge them, because I have to keep them, and i have to give them a poor review. They take a really long time to charge. I do not recommend this larger version.
***EDIT....After posting this review, this company reached out to me and offered me a full refund for both faulty chargers. I will use the money to purchase a couple more of the smaller (10000) versions, because they really are fantastic, and I that trust that they will work. The company did not ask me to update my review, but i am because they did do the right thing after my review was posted.
- Reviewed in the United States on March 31, 2025Color: PinkVerified PurchaseCharges really quick but your phone looses that same charge just as quickly. I just noticed this particular thing but if you just need it for a boost and a quick fix its definitely nice it comes in handy af! I make sure I charge the power bank up too 100% every night and i use it atleast 4xs during the day.
- Reviewed in the United States on October 13, 2024Color: BlackVerified PurchaseMan, these storms just keep coming at us down here. But even if you are in Anchorage, if you don’t mind the weight, this far larger capacity Charmast charger will give you three full charges for most cell phones. The wall plus is convenient but slow. One omission—the product listing and manual makes you think you are getting a Type C cable that is necessary for much faster charging from the Charmast to your Type C wall charging block. So, be sure you factor buying one into your cost—What is needed is a Type C to Type C cable if you do not already have one. One more plus: The outside of the charger gives a numerical reading of current charge percentage. Useful!
- Reviewed in the United States on February 25, 2025Color: BlackVerified PurchaseI LOVE this charger. I’ve had it for over a year now and just added two more to my cart for my husband and daughter. My husband has a much more expensive one I think from Sharper Image but even he likes this one better. I take this on every long car trip I take, I bring it to work everyday, and I take it on vacation. It saved the day at my brother in laws funeral when my husbands other brother needed to charge his phone and didn’t have cords for his own battery pack. Cords are built in so never an issue with mine. It’s a great deal. I charge it about every two weeks and use it almost daily at work. It’s solid, looks and feels nice and is just so convenient and powerful. I really do love this battery pack.
- Reviewed in the United States on February 26, 2025Color: BlackVerified PurchaseI ordered this charger and it stopped working after 2 months. When the company found out, they refunded me entirely. THIS is great customer service!
Top reviews from other countries
- Josee NadeauReviewed in Canada on February 26, 2025
1.0 out of 5 stars Brilliant -- if it actually worked
Color: WhiteVerified PurchaseStopped working after 3 months. I ordered one for a friend and the same happened to them. Sadly, there is no way to get ahold of this company to report, or request a refund at this point.
- Amazon CustomerReviewed in Canada on October 2, 2024
5.0 out of 5 stars Cables with the charger
Color: BlackVerified PurchaseThis is more useful than just a battery because it has the ability to plug directly into your device. I also like the ability to take this battery on the go without having to pack the cables.
- AvaReviewed in Canada on November 12, 2024
1.0 out of 5 stars Worst powerbank - it doesn’t charge
Color: WhiteVerified PurchaseSo after I’ve used all the power in the power bank, I tried to charge the powerbank .for the first time. And it cannot be charged - the battery level display keeps showing 0% no matter low long I charge it for. And it’s just passed the one month return window when I discover this so Amazon doesn’t let me return it. Such a waste of money.
AvaWorst powerbank - it doesn’t charge
Reviewed in Canada on November 12, 2024
Images in this review
- BluekodiakReviewed in Canada on October 7, 2024
5.0 out of 5 stars awesome
Color: BlackVerified Purchaseworks excellent, charges multiple devices on a single charge. Will charge an apple phone and an android phone at the same time.
- Leah PReviewed in Canada on September 30, 2024
5.0 out of 5 stars Best portable charger
Color: BlackVerified PurchaseEasy to use, no loose cords to deal with, compact and easy to charge