Charmast 26,800mAh USB-C power bank (26800mAh) with 3 inputs and 4 iSmart outputs
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Product description
If you need reliable backup power for your phone and tablet while you’re out, a high-capacity USB-C power bank like this one is the kind of purchase that pays off quickly. The Charmast 26800mAh model leans into travel-friendliness: it’s slim, comes with multiple ports, and includes both USB-C input and USB-C output.
That said, it’s not a magic box. Real charging speed still depends on your device and the cable you use, and the advertised “multiple times” figures are best treated as rough guidance rather than a guarantee. With that in mind, here’s how it looks for everyday use in the UK.
Key takeaways
This Charmast battery pack is built around a big 26800mAh capacity and a USB-C bidirectional port, so you can both charge it via USB-C and charge devices via USB-C. You also get three input ports for charging the power bank, plus four iSmart outputs (1 USB-C + 3 USB-A) designed to auto-adjust charging current.
In practical terms, it’s aimed at people who want to charge more than one device on the go—think commuting, day trips, festivals, or long travel days. The compact and slim form factor helps it fit into a bag without feeling bulky.
One thing to note: while it’s described as approved for air travel, you still want to follow airline and airport rules for battery packs and carry them in line with typical guidance.
What it’s for and why the USB-C matters
A power bank with USB-C is handy if you have a modern phone, tablet, or accessories that use USB-C. Here, the USB-C port is “bidirectional”, meaning it supports both input (charging the power bank) and output (charging your device). If your own kit already runs on USB-C cables, that reduces the number of chargers you need to carry.
On a simple day-out scenario: you top up the power bank at home using USB-C, then later plug in your phone via USB-C for a faster-feeling connection. If a friend needs a charge too, you can switch to one of the USB-A ports without needing extra hardware.
Key specifications
- Name: charmast 26800mAh power bank (USB-C battery pack)
- Type: portable charger / power bank
- Capacity: 26800mAh
- Inputs: 3 input ports (USB-C + USB-A)
- Outputs: 4 iSmart output ports (1 USB-C + 3 USB-A)
- USB-C charging (input/output): up to 2.6A / 3A (as stated)
- Charging time (to full charge via USB-C): approximately 9 hours (as stated)
- Dimensions: 3.7 × 7.75 × 0.55 in (as stated)
- Weight: 408 g (as stated)
- Air travel: permitted according to the description
- Safety compliance listed: CE, RoHS, FCC (as stated)
What you’ll notice in day-to-day use
The headline “iSmart” idea here is automatic current adjustment, which (on paper) helps the power bank detect a connected device and provide an appropriate charging current. If you frequently switch between devices—phone, tablet, and older gadgets—this kind of detection can reduce fuss.
Multiple outputs also make a difference to the feel of the product. Instead of choosing between charging your own phone and helping someone else, you can run two, three, or more connections at once using the USB-A and USB-C outputs.
You should still expect normal limitations of portable charging: higher capacity doesn’t remove variability in speed, and some devices will charge slower depending on their own charging support.
Strengths and the likely limitations
What stands out is the combination of a large capacity (26800mAh), USB-C bidirectional support, and a relatively slim, travel-friendly build at 408 g. The mix of 1 USB-C and 3 USB-A outputs gives you flexibility when you’re juggling cables.
Where it may not be the perfect match is if you’re chasing the absolute fastest charging possible for a specific single device. This model is positioned more as a practical everyday travel battery pack than something you’d pick purely for maximum speed in one dedicated port. Also, the “charging multiple times” comparisons in the description are device-specific claims, so the results will vary with your exact phone/tablet and usage.
Care, safety, and what to check before buying
Charmast lists built-in safeguards intended to protect against excessive current, overheating, and overcharging, and it also references CE, RoHS, and FCC. That’s reassuring on paper—especially for an item that you’re likely to take outdoors.
Before you commit, it’s worth checking:
- Whether your main devices charge via USB-C (for the bidirectional USB-C experience).
- Whether you plan to charge multiple devices at the same time (use the 1 USB-C + 3 USB-A outputs accordingly).
- The battery pack’s real-world charging needs for your trips—if you’re doing very long days, you may still want a charging plan rather than relying on one top-up.
Mini FAQ
How many devices can I charge at once?
The description states 4 iSmart output ports in total: 1 USB-C and 3 USB-A, so you can connect multiple devices simultaneously.
Can I charge the power bank using USB-C?
Yes. The USB-C port is described as bidirectional, so it supports charging the power bank via USB-C as well as charging devices.
Is it allowed on flights?
The listing description says it’s permitted in airplanes and meets air transport rules. Still, it’s sensible to follow airline guidance for batteries.
Does iSmart guarantee the fastest charging?
It’s designed to detect and adjust charging current automatically, but actual charging speed depends on your device’s charging capabilities and the cable you use.
Final verdict
It’s a sensible buy if you want a slim, travel-friendly 26800mAh power bank with USB-C bidirectional support and the flexibility of 4 outputs for charging multiple devices. It suits people who regularly travel, commute, or just want dependable backup without carrying a tangle of chargers.
It may not be your best pick if you only charge one device occasionally and care most about absolute maximum charging speed from a single port, or if you don’t use USB-C at all—then the extra ports won’t add much value.
Worth considering if your priority is practical capacity plus USB-C convenience, but keep expectations realistic about charging times for specific devices.