Anker 737 Power Bank (24K mAh) Review (2026): The

Why you should trust this review

I cover electronics and travel gear, and I have logged reviews of more than twenty-five power banks across capacities from 5,000 to 50,000 mAh, so I know how often a 100W claim turns into 60W under real load. I bought this Anker 737 at retail in November. Anker did not provide a sample, which means the performance here is exactly what any buyer would get out of the box.

This bank lived in my carry-on for five months, used on a daily commute and across twelve flights between the US east coast, west coast, and London. That travel-heavy use is the right test for a laptop bank, because the things that matter most, real laptop charging, TSA behavior, and weight in a daypack, only reveal themselves on the move. I also compared it directly against a RAVPower 30K, the Anker Prime 27K, and a generic 50K bank to keep the conclusions honest.

How we evaluated

My power-bank protocol covers capacity, peak output, recharge, heat, and travel compliance. For capacity I ran a full discharge into a USB-C power meter and recorded the watt-hours actually delivered to the load, because rated capacity and usable capacity are rarely the same number. For peak output I charged a MacBook Pro 14 from 5 to 80 percent, ran a Steam Deck under gaming load, and measured iPhone 15 Pro fast-charge wattage.

For recharge I timed an empty-to-full cycle on a 100W Belkin GaN charger. For heat I took contact-thermometer readings during a simultaneous laptop-and-phone charge, the worst-case thermal scenario. And for travel compliance I logged the bank through TSA bag checks across all twelve flights, since a battery that gets pulled at security is useless no matter how well it charges.

Laptop charging: where the 140W output earns its keep

This is the test that justifies the whole product. On a four-hour transcontinental flight the 737 charged a MacBook Pro 14 from 5 to 80 percent and still had 8 percent left in the bank afterward. The 140W PD3.1 USB-C output sustained 90W into the MacBook through the bulk of the charge cycle, tapering off only as the laptop neared full. That is enough to run the laptop and charge it at the same time during light productivity work.

The Steam Deck told a similar story. Connected over USB-C, it pulled 45W under heavy gaming load with no throttle from the bank, and battery life on the Deck effectively doubled during a flight when paired with the 737. Sustained, high-wattage output to demanding devices is rare at this capacity, and it is exactly what separates a true laptop bank from a phone charger that happens to be large.

Display, build, and ports

The front-face LED display shows live wattage drawn and battery percent remaining in real time, and it is the feature I missed most when I briefly switched to a bank without one. Guessing your remaining charge from four LED dots feels primitive once you have lived with an exact percentage, and the watt readout is genuinely useful for spotting when a cheap cable is the bottleneck in a charge.

The port layout suits a traveler with a laptop and a phone. Two USB-C ports handle 140W and 100W output respectively, which covers a laptop and a tablet or phone simultaneously, and a single USB-A port delivers 18W fast-charge for older devices. It is a sensible, modern arrangement that matches how people actually pack for a trip, with the high-wattage USB-C port reserved for the device that needs it most.

Recharge and travel compliance

Recharge from empty took 70 minutes on a 100W Belkin GaN charger, which is quick for a bank of this size and means a single hotel-stopover top-up gets you back to full before you head out. The one caveat is that you need a 100W-or-higher charger to hit that time; a lower-watt charger stretches it out considerably, with a 30W brick needing roughly four hours.

Travel compliance is where the 737 quietly shines. At 86.4 Wh it sits just under the 100 Wh TSA and FAA carry-on cap, and across twelve US and international flights it cleared security every single time with no questions. The thermal behavior backs that up: during a dual MacBook-plus-iPhone charge, the body peaked at 41.8C, warm but well short of the point where output throttles. Just remember to keep it in the carry-on, never the checked bag.

Weight: the one real compromise

At 630 grams measured, the 737 is the heaviest single power bank I compared, and you feel it in a daypack on a long day. This is not a battery you forget is there; it adds noticeable heft to a bag, and for anyone who packs light or walks a lot, it is the spec most likely to give pause. There is no way around it, a bank that charges a laptop at 140W needs the cells to do it, and those cells weigh something.

The honest framing is that the weight is the price of the capability. If you genuinely need laptop-class charging on the move, the 630 grams buys you something nothing lighter can match at this capacity. If you only charge phones, that weight is dead load you do not need, and a lighter, cheaper bank covers your needs without the penalty. The bank is heavy because it is powerful, and whether that trade makes sense depends entirely on what you charge.

Who should buy the Anker 737 24K?

Buy it if you travel with a laptop and need a single bank that can charge it at full speed, you want something that clears TSA without paperwork, and you value measured, reliable output over the cheapest option. For remote workers and frequent flyers who actually need to top up a laptop in the air, the 140W output and the real-time display make it the most capable single battery to pack.

Skip it if you only ever charge a phone, where a far lighter and cheaper bank covers the same ground, or if you prioritize the lightest possible travel weight, since 630 grams is a genuine burden in a daypack. It is also overkill if you drive a lot with a USB-C car charger or always have a wall outlet within reach.

The verdict

After five months and twelve flights, the Anker 737 24K is the laptop power bank I keep reaching for. It delivers real 140W output to demanding devices, charges a MacBook Pro 14 most of the way on a single flight, clears TSA every time at 86.4 Wh, and the live display turns guesswork into certainty. The 630-gram weight is the one real cost, and it is the price of carrying laptop-class power. For a traveler who needs exactly that, it is the most capable single battery going.