For most travelers, the best travel power bank is the Anker Nano Power Bank (10,000mAh, 30W, built-in USB-C cable): it weighs 215 g (7.58 oz), sits far below every airline’s 100 Wh limit, and the attached cable means one less thing to forget. If you need to charge a laptop, step up to the Anker Prime Power Bank (20K, 220W), which is rated at 72.36 Wh and still clears the limit with room to spare.
Capacity is only half the decision in 2026. Several airlines now limit how many power banks you may carry and ban using them in flight, so a bank that is legal under FAA rules may still be the wrong one for your trip. This guide sorts five picks by watt-hours and maps them to those airline rules.
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How we chose
We did not test these power banks. We compared manufacturer spec sheets (capacity, watt-hours, output, input, weight), Amazon listing data including rating counts, and the published power bank rules of the FAA, Emirates, the Lufthansa Group and Southwest Airlines. Every bank on this list is under 100 Wh, because that is the line above which you need airline approval. Ratings and counts were checked on October 19, 2026 and will change. We left prices out because they move daily.
The 2026 rules your power bank has to pass
The FAA’s baseline is simple. Power banks are spare lithium batteries, so they travel in carry-on baggage only. If your carry-on gets checked at the gate, you have to take the power bank out and keep it in the cabin. Rechargeable batteries are limited to 100 Wh each; with airline approval you can bring up to two batteries between 101 and 160 Wh. The terminals must be protected from short circuits, for example in a pouch or the original packaging.
The FAA also notes that many airlines set stricter limits, and that is where most travelers get caught:
- Emirates (since October 1, 2025): one power bank per passenger, under 100 Wh, with the capacity rating visible on it. No charging devices from it on board, no charging it from the seat power, and it must stay in the seat pocket or a bag under the seat, not the overhead bin.
- Lufthansa Group (Lufthansa, SWISS, Austrian, Brussels, Eurowings, Discover; since January 15, 2026): up to two power banks, no use or charging on board, no overhead bin storage. 100-160 Wh banks need airline approval.
- Southwest (since April 20, 2026): one portable charger per passenger, kept out of overhead bins and checked bags, and visible when in use.
So two practical rules follow. First, the bank needs a printed capacity rating, because some carriers won’t accept one without it. Second, if you fly Emirates or Southwest you can bring only one bank, which argues for one good one over two small ones. On Lufthansa Group and Emirates flights the bank is for the airport and your destination, not the seat.
To check any bank yourself, the FAA’s formula is voltage times amp-hours. A 10,000mAh bank with standard 3.6 V cells works out to 10 Ah x 3.6 V = 36 Wh.
Comparison table
| Power bank | Capacity | Watt-hours | Max output | Weight | Amazon rating (Oct 2026) |
|---|---|---|---|---|---|
| Anker Nano Power Bank (30W, built-in USB-C) | 10,000mAh | ~36 Wh (calculated) | 30W single port, 24W total | 215 g / 7.58 oz | 4.4/5 from 10,349 ratings |
| INIU 10000mAh 45W (detachable USB-C cable) | 10,000mAh | ~36 Wh (calculated) | 45W | not verified | 4.4/5 from 88,282 ratings |
| Anker Prime Power Bank (20K, 220W) | 20,100mAh | 72.36 Wh | 140W per USB-C, 220W total | 510 g / 1.12 lb | 4.7/5 from 779 ratings |
| Anker 737 Power Bank (PowerCore 24K) | 24,000mAh | ~86 Wh (calculated) | 140W | not listed by Anker | 4.4/5 from 17,609 ratings |
| Anker Laptop Power Bank (25K, 165W) | 25,000mAh | 90 Wh | 100W per USB-C, 165W total | 595 g / 21.0 oz | 4.4/5 from 12,694 ratings |
Calculated watt-hours use the FAA formula with 3.6 V nominal cells; the printed label on the bank is what the gate agent will read. All five are under 100 Wh.
1. Anker Nano Power Bank (30W, Built-In USB-C Cable): best for most trips
This is the bank to buy if you mainly charge a phone, earbuds and maybe a small tablet. Anker lists it at 104 x 52.3 x 26 mm (4.09 x 2.06 x 1.02 in) and 215 g, with a built-in USB-C cable that doubles as a carry loop, plus a separate USB-C port and a USB-A port. The cable and the USB-C port each deliver up to 30W, and the bank recharges at 30W too. Anker claims the bank reaches 50% in 45 minutes, which matters on a short layover. A small color display shows remaining charge.
Who it’s for: phone-first travelers, one-bank airlines (Emirates, Southwest), and anyone who forgets cables.
Skip it if: you want to charge a laptop. 30W keeps a small laptop going slowly at best.
Pros
- Built-in USB-C cable, so the bank and the cable can’t get separated
- Recharges at the same 30W it outputs
- Around 36 Wh, far under every airline limit we checked
- Large rating base: 4.4/5 from 10,349 Amazon ratings
Cons
- Total output drops to 24W when you use more than one port
- The built-in cable is USB-C only; older Lightning iPhones need their own cable
2. INIU 10000mAh 45W Power Bank: best budget pick
INIU’s 10,000mAh bank is one of the most-rated power banks on Amazon, at 4.4/5 from 88,282 ratings. The listing describes it as 45W fast charging with a detachable USB-C cable, and labels it flight-safe. At 10,000mAh it lands in the same roughly 36 Wh class as the Anker Nano, so it passes every rule above.
Who it’s for: travelers who want a cheap backup bank for phone charging, or a second bank on airlines that allow two.
Skip it if: you want a manufacturer spec sheet with weight and per-port output. We could not verify those on INIU’s own site, so they are left out here.
Pros
- Huge owner base for a budget bank (88,000+ ratings)
- 45W rated output, higher than the Anker Nano’s 30W
- Detachable cable is easy to replace if it frays
Cons
- A detachable cable is also a cable you can lose
- Fewer published specs than Anker’s models
3. Anker Prime Power Bank (20K, 220W): best for laptops on one-bank airlines
If you can only bring one bank and it has to run a laptop, this is the one we’d pick. Anker rates it at 20,100mAh and 72.36 Wh, which leaves a wide margin under 100 Wh. Each of its two USB-C ports delivers up to 140W, the USB-A port 22.5W, and total output is 220W. It recharges at up to 100W over USB-C. It weighs 510 g (1.12 lb) and measures 44 x 50 x 147 mm, so it is noticeably lighter than the two 24-25K banks below.
Who it’s for: laptop users who fly Emirates or Southwest, and anyone who wants high output without crowding the 100 Wh line.
Skip it if: you only charge a phone. You’d carry more than twice the Nano’s weight for capacity you won’t use.
Pros
- 140W per USB-C port covers most laptops that charge over USB-C
- 72.36 Wh is printed in the spec, so there’s no guessing at the gate
- Best Amazon rating in this group: 4.7/5, though from a smaller base of 779 ratings
Cons
- No built-in cable
- Smallest rating sample of the five, so the score is less settled
4. Anker 737 Power Bank (PowerCore 24K): best for heavy charging at the destination
The 737 has been around long enough to collect 17,609 Amazon ratings at 4.4/5. Anker lists 24,000mAh, two USB-C ports and one USB-A port, and 140W max output. The USB-C input also accepts up to 140W (28V, 5A), so with a 140W charger it can refill faster than banks limited to 100W input. It measures 6.13 x 2.15 x 1.95 in. At roughly 86 Wh by the FAA formula it is still under 100 Wh.
Who it’s for: travelers who charge a laptop plus phone every day at the destination and own a high-wattage wall charger.
Skip it if: weight matters to you and you want to compare it on paper. Anker’s spec page doesn’t list it.
Pros
- 140W output and 140W input on USB-C
- Long track record and large rating base
- Digital display for charge status
Cons
- Weight not published on Anker’s spec page
- Older design with no built-in cable; the Prime 20K matches its 140W per-port output in a shorter body
5. Anker Laptop Power Bank (25K, 165W): most capacity under the 100 Wh line
Anker’s support page rates this bank at 25,000mAh and 90 Wh, the most energy on this list without asking the airline. It has two built-in USB-C cables (a 27.6 in retractable one and an 11.8 in lanyard cable), one more USB-C port and one USB-A port. Each USB-C delivers up to 100W, 165W combined. Anker lists a 2-hour recharge at 100W, pass-through charging, and an 18-month warranty. It weighs 595 g (21.0 oz). It is rated 4.4/5 from 12,694 Amazon ratings.
Who it’s for: long trips with little access to outlets (multi-day treks, road trips, long transit days) where you want maximum capacity in one bank that needs no approval.
Skip it if: you’re on a one-bag ultralight setup. It’s the heaviest bank here with a published weight.
Pros
- 90 Wh, the highest capacity on this list, still under 100 Wh
- Two built-in cables cover two devices without packing any extra
- Pass-through charging: plug the bank in at the hotel and charge your phone through it
Cons
- 595 g is heavy for daily carry
- 100W per port is less than the Prime’s 140W, which matters only for the most power-hungry laptops
- Shorter 18-month warranty
Which travel power bank fits your trip
Start with your airline, then your devices, then weight.
- Flying Emirates or Southwest (one bank allowed): buy one bank that covers everything. Phone only: Anker Nano. Phone plus laptop: Anker Prime 20K.
- Flying Lufthansa Group (two banks, no in-flight use): charge everything before boarding. Two 10,000mAh banks, such as the Nano plus the INIU, split the weight between pockets and give you a spare.
- Mostly US carriers following FAA baseline rules: any bank here works. Choose by device: 10,000mAh for phones, 20-25K for laptops.
- Long stretches without outlets: the Anker 25K at 90 Wh gives the most energy you can carry without airline approval.
Expect less than the label from any bank. The mAh figure is measured at the 3.6 V cell level, and some energy is lost converting it to the 5-20 V your phone or laptop draws over USB, so a 10,000mAh bank will not refill a phone with a 5,000mAh battery twice in full.
Pack the bank where you can reach it. Since it can’t go in the overhead bin on Emirates, Lufthansa Group or Southwest, a personal item bag under the seat is the easiest place. Our guide to the best backpacks for air travel personal items covers bags that fit there. For outlets abroad, pair the bank with the right plug, for example from our travel adapter for Mexico guide. If you prefer something thinner for emergencies, see our Travelcard charger review, and for the rest of the tech kit, our travel gadgets list.
FAQ
Can I bring a power bank in checked luggage?
No. The FAA requires spare lithium batteries, including power banks, to travel in carry-on baggage only. If your carry-on is checked at the gate, take the power bank out first.
What size power bank is allowed on a plane?
Up to 100 Wh per battery without approval under FAA rules. Between 101 and 160 Wh you need airline approval and may carry at most two. With standard 3.6 V cells, 100 Wh works out to about 27,700mAh.
How many power banks can I bring on a plane?
The FAA sets no quantity limit for batteries under 100 Wh that are for personal use, but airlines can. Emirates and Southwest allow one per passenger; the Lufthansa Group allows two. Check your carrier before you pack.
Can I use a power bank during the flight?
It depends on the airline. Emirates and the Lufthansa Group ban using or charging power banks on board. Southwest requires the charger to be visible when in use. Plan to charge at the gate.
How do I find the watt-hours of my power bank?
Look for the Wh rating printed on the case. If only mAh is listed, multiply the amp-hours by the cell voltage (usually 3.6 or 3.7 V): 20,000mAh x 3.6 V = 72 Wh.
Sources
All sources checked October 19, 2026.
- FAA PackSafe, Lithium Batteries: faa.gov/hazmat/packsafe/lithium-batteries (carry-on only, 100 Wh / 160 Wh limits, Wh formula)
- Emirates, new power bank rules: emirates.com media centre (one bank, no in-flight use, from October 1, 2025)
- Lufthansa Group, power banks on board from January 15, 2026: business.lufthansagroup.com
- ConsumerAffairs, Southwest one-charger rule from April 20, 2026: consumeraffairs.com
- Anker Nano Power Bank (A1259) spec page: anker.com (weight, dimensions, output, recharge claim)
- Anker Prime Power Bank 20K 220W (A110B): anker.com (capacity, output, weight, dimensions); 72.36 Wh from the Amazon listing (ASIN B0F66NH2ZX)
- Anker 737 Power Bank (A1289): anker.com (capacity, ports, input/output, dimensions)
- Anker Laptop Power Bank 25K 165W (A1695) specification: service.anker.com (90 Wh, cables, weight, recharge time, warranty)
- Amazon listings (ratings and counts): Anker Nano ASIN B0C9CJKCH3; INIU 45W ASIN B0FW34MF6F; Anker Prime 20K ASIN B0F66NH2ZX; Anker 737 ASIN B09VPHVT2Z; Anker 25K ASIN B0DCBB2YTR
- Owner notes / photos: none