Can I bring the Anker 737 on a plane?

The 737 is rated around 86.4 watt-hours, under the 100Wh limit most airlines use for spare lithium batteries in the cabin. Read the watt-hour number printed on the bank. Spare batteries go in the cabin, not in checked luggage. Anker's Amazon listing says this model does not have China's 3C mark and cannot be carried on domestic flights inside China.

Will it charge a laptop at 140 watts?

Only if the laptop accepts that much over USB-C and you use a 5-amp cable. The Anker listing includes a 140W USB-C cable. Many laptops negotiate less than 140W. A 60W cable caps the charge at 60W.

Is 24,000mAh what the phone actually receives?

No. That is the nameplate of the cells. Anker's own listing FAQ says conversion loss means the connected device receives well under 24,000mAh.

Should I buy this if I only carry a phone?

No. Anker lists the 737 at about 6.13 x 2.15 x 1.95 inches and 630 grams, about 22 ounces. That weight is for people charging a laptop. A phone-only trip wants a much smaller bank.

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The portable charger that can fly

Updated September 21, 2026 · Specs from Anker’s 737 page and the Amazon listing sold by AnkerDirect. Not a lab test.

A slim black power bank and a coiled cable on linen — Category photo. The Anker 737 is a thicker brick than the bank in this picture. Read the dimensions below before you picture it in a pocket.

Buy the Anker 737 (PowerCore 24K) if a USB-C laptop is in the bag and you want one battery that can actually feed it. Anker rates it at 24,000mAh and up to 140W, with two USB-C ports and one USB-A. The published watt-hour figure for this model is about 86.4Wh, under the 100Wh line most airlines use. It weighs about 22 ounces. If you only carry a phone, this is the wrong object.

See the Anker 737 on Amazon →

48-second flight-rule checkAvailable September 24 at 12:30 PM PT

The rule that matters more than the milliamp number

Airlines limit spare lithium batteries by watt-hours, not by the mAh printed in the marketing. Under 100Wh is the usual cabin allowance, in your carry-on, with the battery easy to get to. Over 100Wh and up to 160Wh is often allowed only with airline approval, and in small numbers. Checked bags are the wrong place for a loose power bank. If a gate agent tells you the suitcase has to go in the hold, the bank comes out of the suitcase and into the bag that stays with you.

Read the watt-hour number printed on the 737 before the trip. Do not trust a product title. About 86.4Wh is the figure published for this model, which is why it is the pick instead of a bigger “250W” bank sitting on the 100Wh line. Anker’s own Amazon FAQ also says this model does not carry China’s 3C mark and cannot be taken on domestic flights inside China. If that is the itinerary, this is not the bank.

What 140 watts actually means

Model	Anker 737, PowerCore 24K, model A1289
Cells	24,000mAh nameplate. The phone does not receive all of that.
Watt-hours	About 86.4Wh. Confirm the number on the unit.
Output	Up to 140W on USB-C, Power Delivery 3.1
Ports	Two USB-C, one USB-A
Size	6.13 × 2.15 × 1.95 in
Weight	630 g, about 22 oz
In the box	Bank, 140W USB-C cable, pouch

You get 140W only when three things agree: the laptop will accept it, the port you used will offer it, and the cable can carry it. Anker says to use a 5-amp cable, and the listing includes a 140W USB-C cable. A random 60W cable from the junk drawer caps the charge at 60W and makes the bank look broken. Many laptops negotiate less than the maximum even with the right cable. “140W” is the ceiling, not a promise that a MacBook Air will draw the ceiling.

Anker’s listing FAQ is blunt about the other disappointment. Conversion loss means the device on the end of the cable receives well under the 24,000mAh nameplate. Budget a couple of phone charges plus a meaningful laptop top-up, not four full laptop charges.

Who should skip it

Phone only. Twenty-two ounces and a brick the size of a short paperback is a bad trade for a handset. Buy a bank you will actually keep in the pocket you already use.
You need the lightest possible carry-on. This bank is more than a quarter of the empty weight of the Maxlite 5. It earns that weight only if the laptop is coming.
Domestic China. Use a bank that has the certification that itinerary requires. This listing says the 737 does not.

Where it rides

In the personal item, not buried under cubes in a roller that might get checked. The screen on the 737 shows remaining charge and the wattage moving right now, which is the feature you want at a gate when you are deciding whether the laptop or the phone gets the port. It gets warm under a hard charge. That is normal. It should not be left in a closed overhead, under a coat, while it is pushing 140W.

The bank does not change the shape of a foreign outlet. That is the adapter. Charge the 737 the night before from a wall charger that can actually feed it. A phone brick will refill it. It will not refill it quickly.

Questions people ask before they buy

Can I bring it on a plane?

As a spare battery under 100Wh, yes, in the cabin, on most airlines. Read the watt-hours printed on yours. Do not put it in a checked bag. It is the wrong bank for domestic flights inside China.

Will my laptop see 140 watts?

Only if the laptop, the port, and a 5-amp cable all allow it. Use the cable in the box. Expect many computers to draw less.

Does the phone get 24,000mAh?

No. That is the cell rating. Conversion loss means the device receives less. Anker says so on the listing.

Is this the bank for a phone-only trip?

No. It is about 22 ounces. Buy it because a laptop is coming.

As an Amazon Associate, The Travel Cabin earns from qualifying purchases. Dimensions and output are Anker’s. The watt-hour figure is the published rating for this model; the label on the unit is what the airline is looking at. Checked September 21, 2026.

Sources and verification

See the Anker 737 on Amazon