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charmast Power Bank Review: Convenient Four-Cable Charger With a Slow Refill

charmast's power bank packs a 10,000mAh battery and four cables built directly into the case: one for older iPhones and iPads, one USB-C for newer Apple, Samsung and Pixel devices, one Micro-USB for older Android gear, plus a USB-A input for recharging the bank itself. Between the four built-in cables and three extra ports, it can feed up to six devices from one charge. The part that takes getting used to is recharging the bank itself, which runs slow for a real share of units - and a smaller share describe one of the built-in cables wearing out after a year or more of daily use.

By ZappyZep, Tech Editor Published September 27, 2026 Updated September 27, 2026
4.3Our score
charmast Power Bank Portable Charger with Reinforced Built-in 4 Cables charmast Power Bank Portable Charger with Reinforced Built-in 4 Cables, view 2 charmast Power Bank Portable Charger with Reinforced Built-in 4 Cables, view 3 charmast Power Bank Portable Charger with Reinforced Built-in 4 Cables, view 4 charmast Power Bank Portable Charger with Reinforced Built-in 4 Cables, view 5 charmast Power Bank Portable Charger with Reinforced Built-in 4 Cables, view 6 charmast Power Bank Portable Charger with Reinforced Built-in 4 Cables, view 7 charmast Power Bank Portable Charger with Reinforced Built-in 4 Cables, view 8 charmast Power Bank Portable Charger with Reinforced Built-in 4 Cables, view 9
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$22.99 Check price on Amazon

Prices shown were correct on September 27, 2026 and change frequently.

TL;DRThe Short Answer: Is the charmast Power Bank Worth It?

Four cables built into the case mean there is never a missing cord, the whole appeal over a slim single-port power bank. Charging speed splits feedback, and not the way you would expect: power out to a phone runs fast, but refilling the 10,000mAh cell can take the better part of a day, so top it up overnight. Built-in cable durability is a smaller concern. If cable-free convenience matters more than raw capacity, this earns its keep; if a mid-day recharge is a must, plan around the slow refill.

NoFussDeal rates the charmast Power Bank 4.3 out of 5 at $22.99. Last updated September 27, 2026.

What Stands Out

  1. A 10,000mAh cell with four cables built into the case: one for iPhone 12-14 and earlier, one USB-C for iPhone 15 and newer plus Samsung and Pixel, one Micro-USB, and a USB-A input for recharging the bank.
  2. Three built-in output cables plus three additional ports (one USB-C, two USB-A) let it charge up to six devices from a single unit.
  3. A digital display reads the remaining charge to the percent, rather than the rough dot indicators many power banks use.
  4. Smart E 3.0 charging automatically identifies each connected device and delivers up to 3A per port.
  5. A 21-layer protection system guards against overcharging, overdischarging, overheating and short circuits.
  6. At 9.2 ounces and close to the footprint of an iPhone 14, it stays slim despite carrying four cables.

Strengths and Drawbacks

What works

  • Four cables built into the case cover Lightning-style, USB-C, Micro-USB and USB-A input, so there is never a missing cord.
  • Can charge up to six devices at once across the four built-in cables and three additional ports.
  • A digital display reads the remaining charge to the percent rather than a rough dot indicator.
  • Smart E 3.0 automatically adjusts output per device, up to 3A per port.
  • At 9.2 ounces and close to the size of an iPhone 14, it stays pocketable despite carrying four cables.
  • Backed by a 3-year replacement policy for cable or charging issues.

What does not

  • Recharging the bank itself is slow; a real share take most of a day or an overnight charge from empty.
  • Durability is the most-criticized theme in the feedback, mostly tied to one of the built-in cables wearing out after extended use.
  • At 10,000mAh, it holds roughly two phone charges, well below a 20,000mAh bank's capacity.
  • A fixed cable cannot be swapped out the way a detachable one can if it wears loose or frays.
  • Splitting power across all four cables and ports at once stretches a mid-size battery thin.

Features in Depth

01

Four Built-In Cables

Built-In Cables 4 (Lightning-style, USB-C, Micro-USB, USB-A input) Simultaneous Devices Up to 6 Cable Rating 10,000+ bend tested

The reason to choose this over a slimmer, single-cable power bank is the four cables built into the case: one covers iPhone 12 through 14 and older iPads, a second USB-C cable covers iPhone 15 and newer along with most Samsung and Pixel phones, a third Micro-USB cable covers older Android hardware, and a USB-A port handles recharging the bank itself. Combined with two additional USB-A ports and one more USB-C port, the bank can feed up to six devices from a single 10,000mAh cell, though splitting power six ways stretches a mid-size battery thin in practice. The cables are reinforced with braiding rated to more than 10,000 bends, aimed at the specific failure mode of a fixed cable: unlike a detachable cord, it cannot be swapped out if it wears loose, which is the source of the small but real share of units where a built-in cable gives out after extended daily use.

$22.99 4.3/5 Check price
02

10,000mAh Capacity and Digital Display

Battery Capacity 10,000mAh Display 1% precision digital readout Weight 9.2 oz

At 10,000mAh, this sits in the middle of the power bank market: enough for roughly two full phone charges by most accounts, well short of a 20,000mAh bank's capacity but lighter and slimmer for it. A digital display reads the remaining charge down to the percent, a real upgrade over the rough four- or five-dot indicators many power banks still use, making it easy to tell whether one more full charge or a quarter of one remains. At 9.2 ounces, it weighs close to a phone itself and slips into a pocket or bag without the bulk of a larger-capacity unit, the direct tradeoff this size makes: less total power, in exchange for something that disappears into a bag rather than weighing it down.

$22.99 4.3/5 Check price
03

Smart E 3.0 Charging

Charging Technology Smart E 3.0, up to 3A per port Recharge Options 3 (USB-C, USB-A, Micro-USB input) Simultaneous Charging Up to 6 devices

All ports run on Smart E 3.0 technology, which identifies whatever device is plugged in and adjusts its output rather than delivering a single fixed rate, up to 3A per port. That is what makes fast, dependable charging out to a connected phone the norm for most units. The slower half of the story is getting power back into the bank itself: a real share take most of a day to recharge from empty, whether using the bank's own USB-C or USB-A cable or a separate fast charger. That is not unusual for a compact bank whose input circuitry is shared across several built-in cables, but it argues for topping the bank up overnight as routine, rather than expecting a quick top-up between uses.

$22.99 4.3/5 Check price
04

Safety System and Build

Protection Layers 21-layer (overcharge, overdischarge, overheat, short circuit) Warranty 3-year replacement TSA Compliant Yes

Underneath the cables sits a 21-layer protection system covering the failure modes that matter most in a lithium battery: overcharging, overdischarging, overheating and short circuits. The bank is TSA-compliant for carry-on air travel at 10,000mAh, well under the airline limit. It carries a 3-year replacement policy for quality issues, the practical safety net for the durability concerns a real minority describe with the built-in cables - if one wears out or stops charging reliably, that warranty is the route back to a working unit rather than buying a whole new power bank.

$22.99 4.3/5 Check price

How We Scored It

Based on
The manufacturer's published specifications and the product's live Amazon listing.
Owner rating
4.4 out of 5 on Amazon, recorded September 27, 2026
How we score
We score each thing that comes up most in owner feedback on the charmast Power Bank Portable Charger. Eight things come up most in owner feedback: three draw praise, four split opinion and one draws mostly complaints. Its ratings average 4.4 stars (76% five stars, 10% four, 4% three and 10% one or two), so every score starts at 88, that average on a 100 point scale. Where opinion is split, we take off 6. Where it draws mostly complaints, we take off 12. Then we read eight owner reviews in full (every one we found gave it four or five stars) and move the score up to 5 points either way depending on how the owners who mention it rated the product. Our overall score starts from the same 4.4 star average and loses 0.1 for each thing that draws mostly complaints, with 0.1 more when at least a tenth of ratings are one star, never more than 0.3 in all. Here that takes off 0.1, which gives 4.3. Read our editorial standards

Performance

One of the eight owner reviews we read mentions it. That owner gave the product four or five stars. Score 88: its 4.4 star average on a 100 point scale.

88Positive

Portability

Three of the eight owner reviews we read mention it. All of them gave the product four or five stars. Score 93: we started at 88 and added 5 because the owner reviews that mention it are positive.

93Positive

Battery Life

Seven of the eight owner reviews we read mention it, and those owners gave the product four or five stars, so the complaints come from the wider group of buyers. None of the reviews we read say what goes wrong, so this score rests on the buyer ratings. 14% of all ratings are three stars or fewer, which is where complaints like this usually sit. Score 82: we started at 88 and took off 6 because opi…

Read the full note (414 characters)

Seven of the eight owner reviews we read mention it, and those owners gave the product four or five stars, so the complaints come from the wider group of buyers. None of the reviews we read say what goes wrong, so this score rests on the buyer ratings. 14% of all ratings are three stars or fewer, which is where complaints like this usually sit. Score 82: we started at 88 and took off 6 because opinion is split.

82Mixed

Charging Speed

All of the eight owner reviews we read mention it, and those owners gave the product four or five stars, so the complaints come from the wider group of buyers. None of the reviews we read say what goes wrong, so this score rests on the buyer ratings. 14% of all ratings are three stars or fewer, which is where complaints like this usually sit. Score 82: we started at 88 and took off 6 because opini…

Read the full note (412 characters)

All of the eight owner reviews we read mention it, and those owners gave the product four or five stars, so the complaints come from the wider group of buyers. None of the reviews we read say what goes wrong, so this score rests on the buyer ratings. 14% of all ratings are three stars or fewer, which is where complaints like this usually sit. Score 82: we started at 88 and took off 6 because opinion is split.

82Mixed

Reliability

None of the eight owner reviews we read mention it. 14% of all ratings are three stars or fewer, which is where complaints like this usually sit. Score 82: we started at 88 and took off 6 because opinion is split.

82Mixed

Durability

Durability is also mixed, with some saying it lasts a long time while others report it stops working after 6 months. None of the eight owner reviews we read mention it. 14% of all ratings are three stars or fewer, which is where complaints like this usually sit. Score 76: we started at 88 and took off 12 because it draws mostly complaints.

76Needs Improvement

Owner Satisfaction

76% of ratings are five stars and 10% are four. 4% are three stars and 10% are one or two. The spread skews positive, but enough ratings sit low that the drawbacks below are worth reading. Score 88: its 4.4 star average on a 100 point scale.

88Positive

Value for Money

Two of the eight owner reviews we read mention it, and those owners gave the product four or five stars, so the complaints come from the wider group of buyers. None of the reviews we read say what goes wrong, so this score rests on the buyer ratings. 14% of all ratings are three stars or fewer, which is where complaints like this usually sit. Score 82: we started at 88 and took off 6 because opini…

Read the full note (412 characters)

Two of the eight owner reviews we read mention it, and those owners gave the product four or five stars, so the complaints come from the wider group of buyers. None of the reviews we read say what goes wrong, so this score rests on the buyer ratings. 14% of all ratings are three stars or fewer, which is where complaints like this usually sit. Score 82: we started at 88 and took off 6 because opinion is split.

82Mixed

What Buyers Say

Performance and portability draw the strongest praise, and the four built-in cables are the reason many chose this over a bank that needs its own cord brought along separately. Charging speed and overall reliability split opinion about evenly: plenty of units charge a phone fast and dependably, while a comparable share take a long time to refill, occasionally with a cable that stops working reliably. Durability draws the most negative feedback of any theme, concentrated on the built-in cables rather than the battery cell itself.

Based on 10,990 Amazon customer ratings, averaging 4.4 out of 5, recorded 26 September 2026. See the reviews on Amazon

5 stars 76%
4 stars 10%
3 stars 4%
2 stars 3%
1 stars 7%
★★★★★

Good charger! A bit bulky

I bought this over two years ago for my parents to use on an international trip. They told me that it was useful. Since that trip, this portable charger hasn’t been used by anyone, but I rec… Read it on Amazon
Michelle · August 5, 2026 · Verified
★★★★★

A staple in my purse

This portable charger has been such a convenient thing to have, especially when traveling or spending a full day out of the house. My favorite feature is definitely the built-in cables! I lo… Read it on Amazon
S’Agapo Events · September 1, 2026 · Verified
★★★★★

Fantastic Device to own.

This is a great charger! The first time I ordered 1 for myself and 1 for my husband. It's a little heavy but not bulky, so it's easy to carry in a purse, backpack, fannypack or pocket. Every… Read it on Amazon
CHRISTMOM · September 9, 2026 · Verified
★★★★★

My must-have essential for travelling

This is my favorite portable charger that I have bought. I literally bring it everywhere I go, especially when traveling. My favorite feature is that it has all the cords attached for compat… Read it on Amazon
Katie Durow · September 1, 2026 · Verified
★★★★★

Love this PowerBank

Hold enough power for about two full iPhone charges. I also appreciate the versatility of all the cords, as I always have the right adapter for any device. The power bank itself can take a w… Read it on Amazon
Cait · September 9, 2026 · Verified
★★★★★

Got to them, so it’s totally worth it

When you’re gone away and you need that extra charging Bank let me tell you it’s a must go not disappointing at all. The connectivity was so easy. The size was perfect. The compatibility and… Read it on Amazon
KimSchool · September 10, 2026 · Verified

Setting It Up

  1. Charge it fully before first use

    Plug the bank in using its built-in USB-C or USB-A cable, or the Micro-USB input port, and let it reach 100% on the digital display before relying on it. A first charge from empty can take most of a day.

  2. Pick the right built-in cable

    Match the cable to the device: the Lightning-style cable for iPhone 12 through 14 and older iPads, the USB-C cable for iPhone 15 and newer plus most Samsung and Pixel phones, or the Micro-USB cable for older Android hardware.

  3. Connect and check the display

    Plug the device into the matching cable or an open port. The digital display shows the bank's remaining charge as a percentage.

  4. Charge multiple devices if needed

    With four built-in cables and three additional ports, up to six devices can draw power at once, though each gets a smaller share of the total 10,000mAh capacity the more that are connected.

  5. Recharge overnight

    Plug the bank back in once it runs low. Because a full recharge can take several hours, charging it overnight is the more reliable routine than a quick top-up.

Common Questions

How many devices can it charge at once?

Up to six, combining the four built-in cables with the two spare USB-A and USB-C ports, though splitting the 10,000mAh capacity that many ways means each device gets a smaller share of the charge.

Which cable do I use for my phone?

The Lightning-style cable covers iPhone 12 through 14 and older iPads. The USB-C cable covers iPhone 15 and newer, along with most Samsung and Pixel phones. The Micro-USB cable covers older Android devices.

Why does it take so long to recharge?

A full recharge from empty can take most of a day on a real share of units. Charging it overnight, rather than expecting a quick top-up, is the more reliable routine.

How much capacity does the 10,000mAh battery actually give me?

Based on typical use, roughly two full phone charges, a mid-size capacity compared with 20,000mAh power banks.

Is it safe to leave connected overnight?

Yes. It includes a 21-layer protection system covering overcharging, overdischarging, overheating and short circuits.

What happens if a built-in cable stops working?

It is backed by a 3-year replacement policy for quality issues, which covers a cable that wears loose or stops charging reliably.

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The Verdict

4.3Out of 5

For anyone tired of a power bank they cannot use because the right cable is missing, this solves that problem directly: four cables built into the case cover nearly every phone or tablet likely to be in a household, and up to six devices can draw power from it at once. The 10,000mAh cell is a mid-size capacity, good for roughly two phone charges rather than the multi-day buffer a larger bank offers, which keeps the whole unit pocketable at 9.2 ounces. The real compromise is recharging it: a real share take most of a day to refill from empty, so an overnight charge is the practical routine rather than a quick top-up between errands. Durability draws the most negative feedback of any theme, concentrated on the built-in cables rather than the battery itself, and the 3-year replacement policy is the backstop if one gives out. Bought with realistic expectations about capacity and refill time, it earns its keep as a genuinely convenient everyday charger.

Who should buy it

  • Owners of mixed device types
  • Anyone who wants one power bank that covers an iPhone, a newer USB-C phone and an older Android device without extra cables.
  • Bag or pocket carriers who value a compact, cable-free setup over maximum capacity.
  • Buyers who plan to recharge overnight rather than needing a fast midday top-up.

Who should skip it

  • Anyone who needs to recharge a power bank quickly between uses during the day.
  • Heavy users who want a 20,000mAh-class capacity for multi-day trips away from outlets.
  • Buyers who prioritize a detachable cable they can replace over one built permanently into the case.

A genuinely convenient charger for anyone juggling multiple device types, provided you can live with an overnight refill.

Check price on Amazon

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