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Verdict: The Charmast 26,800mAh power bank is a compelling single-battery option for travel and backpacking if you value capacity and multiple ports more than the lightest possible pack or fastest recharge. Independent testing found strong efficiency and portability, but cold-weather capacity loss, a roughly seven-hour recharge, and inconsistent model references mean you should verify the exact SKU before buying.
What you actually get
The W2002P/W2058P versions documented in Charmast’s manual use a 26,800mAh lithium-polymer cell, weigh 338g (about 12oz), and measure 19.71 × 9.6 × 1.42cm. CleverHiker independently measured the weight at 12oz and rated the bank 4.2/5 in 2024.
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| Specification | Published or measured value | Qualification |
|---|---|---|
| Battery capacity | 26,800mAh | Manufacturer/manual cell rating; delivered energy is lower after voltage conversion |
| Weight | 338g / about 12oz | Manual specification; CleverHiker measured 12oz |
| Dimensions | 19.71 × 9.6 × 1.42cm | Charmast manual for W2002P/W2058P |
| Inputs | Three input paths | Documented in the manual; exact port mix depends on the SKU |
| Outputs | Four outputs | Documented in the manual; verify the listing for your model |
| USB-C output | Up to 18W PD | Manual says USB-C is bidirectional and supports 18W PD output |
| Independent recharge test | 6 hours 52 minutes | CleverHiker measurement; cable, charger and conditions affect the result |
| Independent rating | 4.2/5 | CleverHiker, 2024 |
The manual states: “USB-C Power Delivery (PD): The Type-C port supports 18W PD output, compatible with MacBooks and most USB-C smartphones.” That wording describes compatibility, not laptop charging performance at every load; devices negotiate their own power requirements.
How many phone charges does 26,800mAh provide?
There is no universal number because a power bank’s label describes cell capacity, while phones report battery capacity at a different voltage. Conversion losses, cable quality, charging overhead and the phone’s charging behavior reduce the energy that reaches the battery.
#1 Best Overall
- Stay Powered Anywhere: This 20K portable charger delivers 3-4 full phone charges - ideal for camping, flights, or emergencies. Fits easily in backpacks to keep devices alive through weekend trips, festivals, or work travel
- 3-in-1 Built-in Cables: No more hunting for cables! This power bank has USB-C and Micro-USB cables built in, compatible with iPhone and most devices — just plug in and charge. No cord clutter, no hassle
- Wide Compatibility: Compatible with iPhone, Samsung Galaxy, Pixel, iPad, AirPods, Kindle and most tablets. No more carrying multiple chargers — one power bank covers your entire tech lineup
- 22.5W Fast Charging: Get up to a 50% charge in about 30 minutes with 22.5W fast charging. Ideal for quick power-ups before meetings, commutes or when you're rushing out the door
- Exact Battery % — No More Guessing: Unlike basic 4-light indicators, the digital display shows precise remaining power from 0–100%, just like your phone. No more unexpected shutdowns
Use this practical method: compare the bank’s usable watt-hours (if the seller publishes them) with your phone’s watt-hours, then allow for conversion losses. A phone with a larger battery will receive fewer full charges than a smaller phone, and topping up from 20% to 80% uses less bank capacity than repeated full cycles. Treat online “times charged” claims as estimates unless they identify the phone, test method and conditions.
Can it charge several devices at once?
Yes, the design provides four outputs, and USB-C can function as both an input and an output. That makes it suitable for charging a phone, earbuds, a camera or another small USB device together, subject to the output limits of the specific model.
What determines the actual speed?
- The device must support the charging protocol offered by the selected port.
- The cable must be rated for the requested power and wired correctly.
- When several outputs are active, available power may be shared rather than delivered at the maximum to every port.
- Phones and tablets reduce their draw as they approach full charge or heat up.
Check the exact Amazon or retailer listing against the manual before assuming that every product marketed as “Charmast 26800mAh” has the same port layout or wattage.
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- Stay Powered Anywhere: This 20K portable charger delivers 3-4 full phone charges - ideal for camping, flights, or emergencies. Fits easily in backpacks to keep devices alive through weekend trips, festivals, or work travel
- 3-in-1 Built-in Cables: No more hunting for cables! This power bank has USB-C and Micro-USB cables built in, compatible with iPhone and most devices — just plug in and charge. No cord clutter, no hassle
- Wide Compatibility: Compatible with iPhone, Samsung Galaxy, Pixel, iPad, AirPods, Kindle and most tablets. No more carrying multiple chargers — one power bank covers your entire tech lineup
- 22.5W Fast Charging: Get up to a 50% charge in about 30 minutes with 22.5W fast charging. Ideal for quick power-ups before meetings, commutes or when you're rushing out the door
- Exact Battery % — No More Guessing: Unlike basic 4-light indicators, the digital display shows precise remaining power from 0–100%, just like your phone. No more unexpected shutdowns
How long does the Charmast 26,800 take to recharge?
CleverHiker measured 6 hours 52 minutes for a full recharge. That is a useful planning figure, not a guarantee: the wall charger, cable, input protocol, temperature and whether you are using the bank while it charges can all change the time. The USB-C port is bidirectional, so it can be used to refill the bank as well as power compatible devices.
For travel, recharge it overnight or during a long transit rather than expecting a quick top-up between destinations. If rapid turnaround is essential, compare competitors using independently measured recharge times rather than advertised input wattage alone.
Backpacking and travel suitability
Why the capacity helps
At 26,800mAh, this is a high-capacity class of power bank. CleverHiker called it the largest-capacity bank in its test group and praised its efficiency, portability, durability and ability to charge multiple devices. The 338g mass is substantial, but reasonable when one unit replaces several smaller batteries and cables.
Rank #3
- Triple 100W USB-C Ports for Multi-Device Charging: Ideal for laptop users, this 25,000mAh power bank features three 100W USB-C ports for simultaneous charging—perfect for remote work, home offices, or powering up multiple devices on the go.
- 25,000mAh for Long-Haul Power: Tackle week-long trips or extended camping with 25,000mAh capacity and ultra-fast recharge speeds for the power bank when used with a 100W or higher charger. (Note: Complies with 100Wh airline restrictions and is airline carry-on friendly.)
- Dual Built-In Cables for Travel: Features two USB-C cables, one extendable up to 2.3 ft with 20,000 retractions, and another at 0.98 ft cable that doubles as a durable carrying strap capable of enduring more than 20,000 bends. Built to handle family travel, outdoor activities, and emergency backup needs.
- Charge 4 Devices at Once: Power up smartphones, tablets, or other USB-enabled devices thanks to dual USB-C cables, a USB-A port, and a USB-C port.
- What You Get: Anker Power Bank (25K, 165W, Built-In and Retractable Cables), protective pouch, user manual, 18-month warranty, and our friendly customer service. (Note: Charger shown in the video is not included.)
Where it falls short outdoors
CleverHiker observed capacity loss in cold temperatures. Keep the bank inside an insulated clothing pocket or sleeping bag at night, and warm it before charging a phone in freezing conditions. The measured recharge time is also slower than some competing banks, so capacity planning matters on trips without regular access to a wall outlet.
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Air travel and packing
The sources here do not establish a universal airline policy for every country or carrier. Check the current rules for your departure and arrival jurisdictions, and carry a high-capacity lithium battery in the cabin if the applicable airline requires that. Do not rely on a retailer’s generic travel wording as a substitute for the airline’s current policy.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which Charmast 26,800mAh model should you buy?
Start with the exact model number, not just the capacity in the title. The manual identifies W2002P and W2058P, while Amazon and other listings use overlapping references. Before ordering, match these details:
Rank #4
- Stay Powered Anywhere: This 20K portable charger delivers 3-4 full phone charges - ideal for camping, flights, or emergencies. Fits easily in backpacks to keep devices alive through weekend trips, festivals, or work travel
- 3-in-1 Built-in Cables: No more hunting for cables! This power bank has USB-C and Micro-USB cables built in, compatible with iPhone and most devices — just plug in and charge. No cord clutter, no hassle
- Wide Compatibility: Compatible with iPhone, Samsung Galaxy, Pixel, iPad, AirPods, Kindle and most tablets. No more carrying multiple chargers — one power bank covers your entire tech lineup
- 22.5W Fast Charging: Get up to a 50% charge in about 30 minutes with 22.5W fast charging. Ideal for quick power-ups before meetings, commutes or when you're rushing out the door
- Exact Battery % — No More Guessing: Unlike basic 4-light indicators, the digital display shows precise remaining power from 0–100%, just like your phone. No more unexpected shutdowns
- Confirm the printed SKU on the listing, packaging or manual.
- Count and identify the input and output ports shown for that SKU.
- Verify that USB-C is bidirectional and that the listing specifies 18W PD if you need USB-C fast charging.
- Check dimensions and weight if your backpack has a tight electronics compartment.
- Read the regional warranty and return terms attached to that seller and model.
Price, warranty and value
A regional Charmast store page captured a price of €27.99, reduced from €35.99, along with a three-year warranty and a 30-day money-back guarantee. Those terms and prices can change by region and date, so confirm them at checkout. The value proposition is strongest when you need one large bank with several outputs; a smaller bank may be preferable if every gram matters or you usually have daily access to power.
Setup checklist for dependable use
- Use a known-good USB-C cable and a wall charger that supports the bank’s documented input profile.
- Fully charge the bank before a trip and test every port with your actual devices.
- Label cables so high-power USB-C devices are not accidentally paired with unsuitable leads.
- Keep the bank dry and protected from crushing, punctures and extreme heat.
- In cold weather, insulate the bank and expect reduced available capacity until it warms.
Who should buy it?
Choose the Charmast 26800mAh power bank if you want high capacity, multi-device charging and a moderate weight for the amount of energy carried. It is a sensible travel or backpacking centerpiece when overnight recharge is acceptable.
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Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
