- Best Overall: 10,000mAh USB-C PD power bank — Everyday phone top-ups and travel
- Best for Laptops: High-wattage (65–100W) USB-C laptop power bank — Charging laptops and tablets on the go
- Best High-Capacity: 20,000mAh fast-charging power bank — Multi-day trips and multiple devices
- Best Pocket / Value: Slim 5,000mAh power bank — Emergency phone top-ups on the go
Power banks are sold on mAh, but real usable capacity and charging speed (watts) matter just as much. We compare portable chargers from pocket phone-toppers to laptop-class banks, explain why you never get the full rated capacity, and help you pick the right size and speed for travel, work or emergencies.
Our top picks
We chose these based on the criteria below. Product types are described generically so the advice stays useful across brands and model years; use the search links to see current options.
10,000mAh USB-C PD power bank
Best for: Everyday phone top-ups and travel ·
What we like
- Pocketable yet ~1.5–2 phone charges
- USB-C Power Delivery fast charging
- Recharges quickly itself
- Right size for daily carry
Watch-outs
- Not enough for laptops
- Real capacity below the rated mAh
The sweet spot of size and capacity.
High-wattage (65–100W) USB-C laptop power bank
Best for: Charging laptops and tablets on the go ·
What we like
- Powers many USB-C laptops
- High total capacity for all-day work
- Multiple fast ports
Watch-outs
- Large and heavy
- Premium pricing
Confirm your laptop's required wattage first.
20,000mAh fast-charging power bank
Best for: Multi-day trips and multiple devices ·
What we like
- Several charges for phones and small devices
- Charges two devices at once
- Good for travel and camping
Watch-outs
- Bulkier to carry
- Slower to recharge
Stay under airline limits for carry-on travel.
Slim 5,000mAh power bank
Best for: Emergency phone top-ups on the go ·
What we like
- Ultra-pocketable
- Enough for an emergency top-up
- Inexpensive
Watch-outs
- Limited to less than a full charge sometimes
- Lower output speed
A great just-in-case bank that disappears in a pocket.
How to choose power banks
Before you compare specific picks, weigh up the factors below. They are the ones that genuinely affect how happy you will be in daily use — in roughly the order most buyers should prioritise them.
Capacity (mAh) vs real usable charge
Rated mAh is the cell capacity; you actually get roughly 60–70% out due to voltage conversion. A 10,000mAh bank delivers around 1.5–2 phone charges, not the number you might expect. Plan around usable, not rated, capacity.
Output power (watts) and USB-C PD
Watts determine charging speed and what you can charge. ~18–30W fast-charges phones; 45–100W USB-C Power Delivery can charge tablets and many laptops. Match output to your devices.
Ports and number of devices
USB-C is now essential; multiple ports let you charge several devices at once. Check that the high-wattage port is the one you need for fast or laptop charging.
Size, weight and pocketability
Capacity adds bulk. A slim 5,000–10,000mAh bank fits a pocket; 20,000mAh+ is for bags and trips. Buy the smallest bank that covers your real need.
Recharge speed and pass-through
A bank that recharges quickly over USB-C is far more usable. Pass-through (charging the bank and a device at once) is handy for overnight top-ups.
Safety and airline rules
Quality cells and protection circuits matter for safety. For flights, most airlines cap power banks around 100Wh (~27,000mAh) in carry-on — check before buying a very large bank for travel.
How they compare
Specs and jargon, explained
The terms you will see on spec sheets, in plain English:
| Term | What it means for you |
|---|---|
| Capacity (mAh) | Cell capacity. Usable output is ~60–70% of this after conversion losses. |
| Output (W) / USB-C PD | Charging power. ~18–30W fast-charges phones; 45–100W PD charges tablets/laptops. |
| Ports (USB-C / USB-A) | USB-C is essential and usually the fast/laptop port; extra ports charge multiple devices. |
| Recharge time | How long to refill the bank, ideally over USB-C PD; faster is far more convenient. |
| Watt-hours (Wh) | Capacity in energy. Airlines typically cap carry-on power banks near 100Wh (~27,000mAh). |