A Good Portable Charger: Top Picks and Buying Guide
Quick Answer
A good portable charger for most people holds 10,000 to 20,000mAh, supports fast charging over USB-C and has at least two ports or a built-in cable. A 10,000mAh model charges most phones around twice and fits a pocket, while 20,000mAh suits travel and sharing. Check the output in watts for tablets and laptops, keep it in your hand luggage when flying, and stop using any charger that swells or overheats.
Key Takeaways
- A 10,000mAh portable charger covers a busy day for most phones.
- Real-world output is lower than the rated capacity because of conversion losses.
- USB-C with fast charging refills phones and the charger itself much faster.
- Laptops need high-wattage USB-C output, so check the watts.
- Power banks must go in hand luggage, not checked bags, on flights.
How Much Capacity Do You Need?
Capacity is measured in milliamp-hours (mAh), but some energy is lost when the battery's voltage is converted for your device, so expect to get roughly two-thirds of the rated figure.
| Capacity | Approximate phone charges | Best for |
|---|---|---|
| 5,000mAh | About one | Pocket top-ups and nights out |
| 10,000mAh | About two | Daily carry and commuting |
| 20,000mAh | About three to four | Travel, camping and sharing |
| 25,000mAh and above | Several, or a laptop top-up | Long trips and laptops |
Bigger batteries are heavier, so choose the smallest portable charger that covers your usual day.
Charging Speed and Ports
Speed depends on the output in watts and the fast-charging standards a portable charger supports.
| Output | What it charges well |
|---|---|
| 10 to 12W | Phones, earbuds and watches at standard speed |
| 18 to 25W | Fast charging for most modern phones |
| 30 to 45W | Tablets and small laptops |
| 60 to 100W | Most USB-C laptops |
Look for USB-C Power Delivery support, which works across most modern phones and laptops. A built-in cable means one less thing to forget, and a digital display shows exactly how much charge is left.
Types of Portable Charger
- Standard power banks: the best balance of capacity, speed and price.
- Magnetic wireless power banks: snap onto compatible phones for cable-free top-ups, though wireless charging is slower and less efficient.
- Solar power banks: handy as an emergency backup outdoors, but the small panel charges very slowly, so recharge from the mains whenever you can.
- Multi-function devices: fans, lights or tyre inflators with a built-in battery, useful when you need both jobs done.
For most people, a standard portable charger with USB-C fast charging is the best all-rounder, with a solar or wireless model as a second option for specific needs.
How to Choose a Portable Charger
- Check your phone's battery size and how many top-ups you need.
- Choose capacity: 10,000mAh for daily use, 20,000mAh for travel.
- Match the output in watts to your fastest-charging device.
- Count the ports you need for charging several devices at once.
- Check weight and size if it will live in a pocket or small bag.
- Look for overcharge, short-circuit and temperature protection in the listing.
For more detail on capacity and flying, see our guide on how to pick a power bank, and for wall chargers, our tips on where to get a good charger.
Flying With a Power Bank
Airlines generally require spare lithium batteries, including any portable charger, to travel in hand luggage rather than checked bags. Batteries up to 100 watt-hours are usually allowed, and those between 100 and 160 watt-hours need airline approval. A 20,000mAh charger at a typical 3.7V is around 74 watt-hours. Rules vary, so check with your airline before you fly.
Safety and Care
- Stop using any charger that swells, smells, leaks or gets unusually hot.
- Don't charge it on a bed, sofa or anywhere heat can build up.
- Keep it out of hot cars and direct sun.
- Use a good-quality cable rated for the charging speed.
- Recycle old power banks at an electronics collection point, never in household rubbish.
What to Expect at Each Price
- Under $25: compact chargers and multi-function devices with small batteries.
- $25 to $35: 10,000 to 20,000mAh fast-charging, wireless and solar models.
- $40 to $80: high-wattage chargers that can top up laptops.
A good portable charger doesn't need to cost much, but spending a little more buys faster charging, better protection circuits and a longer life.
Cables Matter Too
A slow or damaged cable can halve charging speed. Our guide to choosing the right type of USB cable explains connectors and data versus charge-only leads.
The Bottom Line
Choose 10,000mAh for everyday carry or 20,000mAh for travel, make sure the output suits your devices and look for USB-C fast charging and proper safety protection. Keep it in your hand luggage, stop using it if it swells, and a good portable charger will keep you powered for years.
Portable Chargers at Global Swanky
These picks from our range cover everyday, wireless and outdoor needs.
1. 20,000mAh Fast-Charging Power Bank
The 22.5W Fast Charging Power Bank 20000mAh with Built-in Cable and Digital Display is $32.33, for travellers who want plenty of capacity and a built-in cable.
2. Magnetic Wireless Power Bank
The Power Bank with Fast Charging and Magnetic Wireless for Phones, Watches, and Earphones is $29.71, for cable-free top-ups of phones, watches and earbuds.
3. Solar Power Bank
The Solar Charger Power Bank 20000mAh with Built-in Cable for Outdoor Use is $26.83, for campers and hikers who want an emergency solar backup.
4. Neck Fan with Power Bank
The Portable Neck Fan with Power Bank Function for On-the-Go Cooling is $22.27, for hot days when you want cooling and a small phone top-up.
Frequently Asked Questions
What size portable charger do I need?
10,000mAh suits daily use for most phones, while 20,000mAh is better for travel or charging several devices.
Why doesn't my power bank deliver its full capacity?
Energy is lost converting the battery's voltage for your device, so you typically get around two-thirds of the rated figure.
Can I take a power bank on a plane?
Usually yes, in hand luggage only. Most airlines allow batteries up to 100 watt-hours without approval.
Can a portable charger charge a laptop?
Yes, if it offers USB-C Power Delivery at the wattage your laptop needs, often 45W or more.
Is it safe to leave a power bank charging overnight?
Good models stop charging when full, but charge on a hard, cool surface and never under pillows or on bedding.
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