A power bank is the least glamorous thing in your bag and the one you notice the second it isn't there. This guide covers how to actually choose one in 2026 — what the specs mean, which ones matter for your devices, and which models in the FanzyMarket power bank range we'd point you toward for each use case. Every pick below is a product we stock and ship, with the price it sells for at the time of writing.
How to choose a power bank: the four specs that matter
1. Capacity (mAh) — and how to read it honestly
Capacity is quoted in milliampere-hours. A 10,000mAh bank will realistically refill a modern smartphone about 1.5 to 2 times, not the 2.5 the arithmetic suggests — voltage conversion costs you roughly 25–35% of the number on the label. A 20,000mAh bank covers a long weekend for one phone, or a phone plus earbuds plus a smartwatch for a couple of days.
A word of caution that applies across the whole category, ours included: capacity figures on portable chargers are wildly inconsistent between suppliers. Some quote the raw cell rating, some quote usable output, and some quote numbers that no lithium cell of that physical size could hold. A genuine 100,000mAh pack would weigh several kilograms and wouldn't be allowed on a plane. If a bank is small enough to hold in one hand, judge it by its output wattage, port count and weight rather than the headline mAh number. Those three specs are measurable and they're what you'll actually feel in daily use.
2. Output wattage — this is what "fast charging" really means
Wattage decides how quickly your device fills up, and it's the spec most people ignore. Rough guide:
- 10–15W — trickle. Fine overnight, frustrating during a layover.
- 20–30W — proper fast charging for phones. Most iPhones and Android flagships max out around here.
- 45–65W — tablets, Nintendo Switch, and thin-and-light laptops like a MacBook Air or Dell XPS 13.
- 100W+ — full-size laptops, portable monitors, and charging several devices at full speed at once.
Look for USB Power Delivery (PD) support specifically. PD is the standard both Apple and Android devices negotiate over USB-C, and a bank without it will charge slowly no matter how big its battery is.
3. Ports and built-in cables
USB-C is the default in 2026. USB-A is still worth having for older accessories. The feature that changes the daily experience most is built-in cables — a bank with the cable attached is a bank you can't leave the cable for at home. Several of our picks below have two to four cables integrated into the housing.
4. Form factor: magnetic, slim, or high-capacity
Magnetic (MagSafe-compatible / Qi2) banks clip to the back of a compatible iPhone and charge without a cable, which is genuinely useful when you're walking around with the phone in your hand. They're slower than wired and they add thickness. Slim wired banks are lighter and faster. High-capacity banks are neither, but they'll run a laptop.
Our picks from the FanzyMarket range
Best overall: 20,000mAh 66W Fast Charge Power Bank
The 20000mAh 66W power bank with built-in cable and digital display (from $35.99) is the one we'd recommend to most people. 20,000mAh is the sweet spot — enough for a weekend away, still comfortably under the 100Wh airline carry-on limit. 66W output charges a phone at full speed and will keep a tablet or a light laptop topped up. The built-in cable means one less thing to forget, and the digital display shows remaining percentage rather than four vague LEDs.
Best for: commuters, travellers, anyone who wants one bank to cover everything. Trade-off: it's a pocket-stretcher, not a pocket-sized unit.
Best budget: 5,000mAh Ultra-Slim Magnetic Wireless Power Bank
The 5000mAh ultra-slim Qi2 clip-on battery starts at $19.99 and is the cheapest sensible entry point. It magnetically clips to the back of a compatible phone, adds roughly one full charge, and is thin enough to leave attached while you use the phone. It has built-in cables and an LED display too, which is unusual at this price.
Best for: topping up during a night out or a commute. Trade-off: 5,000mAh is one charge, not a weekend.
Best for laptops: 30,000mAh 65W PD Triple-Port
The 30000mAh 65W PD power bank with triple ports ($62.99) is the practical laptop choice. 65W over USB-C PD is enough to charge a MacBook Air or most 13–14" ultrabooks while you work, and the three ports mean your laptop, phone and headphones can all draw at once. The LED display matters more here than elsewhere — with a laptop you want to know exactly how much is left.
Best for: working away from a desk, long-haul flights, conferences. Trade-off: noticeably heavier than a phone bank.
Best premium: 165W 25,000mAh with Retractable Cables
The 165W 25000mAh retractable-cable power bank ($125.99) is the top of our range and the one to buy if charging speed is the point. 100W on the USB-C port is full-speed charging for a 14" MacBook Pro; 165W total across outputs means nothing throttles when you plug in a second and third device. The retractable cables tuck back into the metal housing instead of dangling.
Best for: photographers, video crews, anyone running multiple devices hard. Trade-off: it costs more than most laptops' spare chargers.
If you want the same 100W class at a lower price and don't need 165W total, the 100W retractable USB-C PD/PPS power bank ($100.99) is the alternative.
Best compact: Mini 4,500mAh Dual USB-C with Wireless
The mini 4500mAh power bank with dual USB-C and 10W wireless charging ($24.99) is the one that disappears into a jacket pocket. Two USB-C ports plus wireless charging is a lot of flexibility for something this small.
Best for: a permanent bag or glovebox resident. Trade-off: emergency capacity only.
Best magnetic / MagSafe-compatible: 10,000mAh Qi2 20W
The 10000mAh magnetic wireless power bank with 20W PD and Qi2 (from $34.99) is the best balance in the magnetic category. Qi2 is the current standard — it aligns magnetically and charges faster than older generic magnetic banks. 20W PD on the wired port means you're not stuck with slow wireless speeds when you're in a hurry.
If you want the same idea cheaper, the 15W MagSafe-compatible magnetic battery pack ($30.99) comes in 5,000 and 10,000mAh versions.
Best for: iPhone 12 and newer, cable-free daily carry. Trade-off: wireless charging is less efficient — you lose energy as heat.
Best for camping and outdoors: Waterproof Solar Power Bank with Flashlight
The waterproof solar power bank with 20W dual USB, LED display and built-in flashlight ($33.99) is built for the campsite rather than the commute: water-resistant housing, an integrated flashlight, and a solar panel for emergency top-ups.
Be realistic about the solar panel. A panel this size gathers a trickle — think of it as a way to keep the bank from dying over several days off-grid, not as a way to recharge it. Charge it from the wall before you leave.
Best for: camping, festivals, emergency kits, van life. Trade-off: bulky, and solar is a backup rather than a primary charging method.
Best small extra: LED Flashlight with Power Bank Function
Not a power bank first, but worth knowing about: the 300-lumen rechargeable COB flashlight with tail magnet and power bank output (from $12.99) is a torch, a magnetic work light and an emergency phone charger in one. It lives well in a car door pocket.
Side-by-side comparison
| Model | Capacity | Max output | Key feature | Best for | Price from |
|---|---|---|---|---|---|
| 20,000mAh 66W Built-In Cable | 20,000mAh | 66W | Built-in cable, digital display | Best overall | $35.99 |
| 5,000mAh Ultra-Slim Qi2 | 5,000mAh | Qi2 wireless + wired | Clip-on, ultra-slim | Best budget | $19.99 |
| 30,000mAh 65W PD Triple-Port | 30,000mAh | 65W PD | Three ports, LED display | Laptops | $62.99 |
| 165W 25,000mAh Retractable | 25,000mAh | 165W total / 100W USB-C | Retractable cables, metal body | Best premium | $125.99 |
| Mini 4,500mAh Dual USB-C | 4,500mAh | 10W wireless | Pocket size, dual USB-C | Most compact | $24.99 |
| 10,000mAh Magnetic Qi2 20W | 10,000mAh | 20W PD | Qi2 magnetic attach | MagSafe iPhones | $34.99 |
| Waterproof Solar with Flashlight | High-capacity | 20W | Solar panel, flashlight, water-resistant | Camping & outdoors | $33.99 |
| 165W 10,000mAh Colour Display | 10,000mAh | 165W | Colour smart display, built-in USB-C | Fast charging, small size | $68.99 |
Prices are correct at the time of writing and shown in USD. Check the product page for current pricing and variant options — several of these come in more than one capacity.
How we chose these
These aren't lab-tested results and we won't pretend otherwise. Our picks are based on three things: the specifications that actually govern real-world performance (output wattage, PD support, port configuration, weight), how each product performs against others at the same price in our own catalogue, and the feedback and return patterns we see from customers who've bought them. Where a product's advertised capacity looks implausible, we've said so above rather than repeating it as fact.
If you buy one of these and it doesn't do what this guide says it will, that's a problem we want to hear about — it's covered by our returns policy, and it tells us this page needs correcting.
Frequently asked questions
How many phone charges will a power bank actually give me?
Divide the bank's capacity by your phone's battery, then subtract about 30% for conversion loss. A 10,000mAh bank and a 4,000mAh phone gives roughly 1.7 real charges, not 2.5.
Can I take a power bank on a plane?
Yes, in carry-on baggage only — never in checked luggage. Most airlines allow up to 100Wh without approval, which is roughly 27,000mAh at 3.7V. Between 100Wh and 160Wh you usually need airline permission. Banks that claim capacities far above this are almost certainly not rated at those figures in reality, but if you're unsure, check with your airline before you fly.
What's the difference between PD, Quick Charge and Qi2?
Power Delivery (PD) is the USB-C fast-charging standard used by iPhones, most Android phones and laptops. Quick Charge is Qualcomm's older standard, mostly relevant for legacy Android devices. Qi2 is the current wireless charging standard with magnetic alignment — effectively the open version of MagSafe.
Will a magnetic power bank work with my phone?
Magnetic banks attach properly to iPhone 12 and newer, and to Android phones with a Qi2-compatible magnetic case. Without magnets in the phone or case, they'll still charge wirelessly but won't stay attached.
Do I need a 100W power bank?
Only if you're charging a laptop. For phones and tablets, anything above 30W is spent capability — your device won't draw more than it's rated for.
How do I make a power bank last longer?
Don't run it to zero repeatedly, don't leave it in a hot car, and top it up every few months if it's sitting unused. Store it around half charged rather than full or empty.
Is pass-through charging safe?
Pass-through — charging your device while the bank itself is plugged in — is safe on banks designed for it, but it generates more heat and puts more cycles on the cells. Use it when convenient, not as your normal routine.
The short version
For most people the answer is a 20,000mAh bank with 60W+ PD output and a built-in cable — in our range, the 20,000mAh 66W. Buy magnetic if you own a recent iPhone and hate cables. Buy 65W or higher if a laptop is in the equation. Ignore the biggest mAh numbers on any listing, anywhere, and read the wattage instead.
You can browse the full range in Power Banks & Chargers, or see everything portable in Electronics.