Anker 737 Power Bank (PowerCore 24K) Review — 2026

Power banks live or die on three things: usable energy, how fast they move it to devices (and refill themselves), and how well they handle heat and multi‑device use over months. The Anker 737’s promise is straightforward: deliver laptop‑grade USB‑C Power Delivery in a carry‑on‑legal brick you can live with on the road.

The Anker 737 Power Bank (PowerCore 24K) 24,000mAh charges single devices fast, keeps total output high with multiple devices, and stays airline‑friendly at a printed 86.4Wh—weight and price are the trade‑offs. Over months, owners report stable capacity, predictable USB‑C behavior, and only minor heat‑related slowdowns under sustained heavy loads.

What “performance” means for a power bank in 2026

For a travel power bank, performance shows up in five places you notice on day one: usable energy delivered (watt‑hours that reach your devices), peak and sustained output power, total budget when multiple ports are active, time to recharge the bank itself, and flight compliance. The Anker 737 is rated 24,000mAh/86.4Wh, important because airlines regulate by watt‑hours; staying under 100Wh keeps you in the carry‑on clear. Anker prints the 86.4Wh rating on regional product pages and packaging, and established outlets echo it. That rating plus two USB‑C ports capable of Extended Power Range (EPR) 28V negotiation make the 737 unusual among sub‑100Wh banks: it can push up to 140W to a single USB‑C device—firmly laptop territory. USB‑IF documentation outlines the 28V/140W PD 3.1 tier that enables this behavior. (anker.tw)

Performance also depends on how the bank splits power. Anker documents that the 737’s 140W is a shared total; when you connect two or three devices, the controller allocates wattage dynamically so per‑port peaks drop while total output remains capped. Reviewers and teardown engineers (notably ChargerLAB) have verified PD 3.1 behavior, component quality, and thermal design that allow those levels in a travelable chassis. (service.anker.com)

Day‑one setup: getting the Anker 737 Power Bank (PowerCore 24K) 24,000mAh ready

In the box: the bank and a 140W‑rated USB‑C cable. For the first charge, use a wall charger that supports USB‑C PD 3.1/EPR (28V) to unlock the highest input—your old 20–65W phone charger will work, but it’ll be slower. The included EPR‑rated cable matters; running 28V/5A to hit 140W reliably requires the right cable and a charger that advertises the EPR profile during negotiation, per the USB‑IF. If you don’t own a 100–140W charger, expect a slower refill but identical on‑the‑go output. (usb.org)

Before travel, long‑press the side button to explore the smart display’s readouts (in/out watts, time‑to‑empty/‑full). Toggle trickle‑charge mode for earbuds and watches—this prevents auto‑shutoff on very low draws, as described in Anker’s quick‑start documentation. Finally, favor the USB‑C1 port for your highest‑priority device; under split loads, it’s typically the controller’s first pick for maximum allocation. (lp.ankerjapan.com)

Charging speed and port behavior in everyday use

Single‑device charging is where the 737 feels premium. Plug a modern USB‑C laptop into C1 with the included cable and you’ll see triple‑digit watts on the display early in the session before the laptop’s battery management tapers. In practice, that means an ultraportable can go from “low‑battery warning” to a workable charge during boarding or a quick coffee stop. Charging specialists and publications have repeatedly shown the 737 sustaining high power and negotiating PD 3.1 EPR correctly; ChargerLAB’s teardown and compatibility testing are instructive on how the controller, MOSFETs, and thermal design deliver stable 28V operation. (chargerlab.com)

Add a second device and the 737 shares its 140W budget. Anker’s support literature is explicit: the total stays at 140W and is divided according to each device’s real‑time request. In the common split—laptop plus phone—you’ll typically see the laptop hold priority while the phone fast‑charges below its own peak, then the allocation shifts upward as the laptop tapers. This is standard PD behavior and avoids connect‑disconnect oscillations while keeping thermals in check. If you add a third device via USB‑A, expect total output to remain capped and per‑port peaks to drop; finish the big laptop top‑up before connecting everything else. (service.anker.com)

Travel and portability: flights, hotel nights, and commutes

The 737 is built for air travel. At a printed 86.4Wh (24,000mAh at nominal cell voltage), it stays under the 100Wh threshold the U.S. Federal Aviation Administration uses for carry‑on spares; you can bring it aboard without special approval. The FAA also requires power banks to ride in carry‑ons, not checked baggage. That compliance story, plus a compact but dense footprint that fits airline seat pockets and rail tray tables, is why travelers on Amazon and Reddit praise it even as they note the heft versus 10K–20K banks. For packing, many owners coil the included EPR cable around the bank and add a short USB‑C for phones to avoid mid‑flight swaps. (faa.gov)

View the underlying data

Measure	Capacity
Anker 737 Power Bank	86.4 Wh
Airline limit (reference)	100 Wh
Typical 20,000mAh bank	74 Wh

Anker A1289 regional listings show 86.4Wh; FAA limits spares <100Wh without approval.

Longevity and sustained performance over months

Lithium‑ion capacity fades with cycles and heat, so the long‑term question is less “does it hit 140W?” and more “how much energy remains after six, twelve, or twenty‑four months?” Independent battery references and peer‑reviewed studies show a familiar curve: quality 21700 NMC cells typically hold about 80–90% after a few hundred moderate cycles when kept cool, with faster fade at higher temperatures and aggressive high‑C discharges. Battery University’s cycle‑life guidance and recent 21700 experiments published in MDPI align with owner reports for the 737: capacity is predictable through the first year, then declines gradually. The smart display helps you notice this by showing real‑time in/out power and time estimates; if you see earlier‑than‑expected cutoffs on a familiar device, adjust expectations or charging habits. Practical tip: avoid leaving the bank full in hot cars, and if you rarely need 100% capacity, charging to ~80–90% before short trips can slow aging. (batteryuniversity.com)

• Quality 21700 NMC (aggregated)
• Lower‑tier cells (est.)

View the underlying data

Item	Quality 21700 NMC (aggregated)	Lower‑tier cells (est.)
0	100%	100%
100	96%	93%
200	92%	88%
300	88%	83%
400	85%	78%
500	82%	75%

See Battery University BU‑808 and MDPI 21700 cycle‑aging study.

Where the 737 excels—and where owners hit the limits

Aggregated reviews (overall 4.6/5 across ~23,740 ratings) point to clear sweet spots:

• One USB‑C laptop plus a phone or earbuds—fast and drama‑free.
• Long‑haul flights or train days when seat power is unreliable—the 86.4Wh pool covers several full phone charges plus a meaningful laptop top‑up.
• Photo/video travel and drones—enough headroom to fast‑charge modern camera bodies and USB‑C chargers without falling into low‑power modes.

Limits surface predictably. Split the 140W budget three ways and per‑device speeds fall; that’s inherent to the cap, not a defect. Run the bank near 100–140W for long stretches and it will feel warm and may taper slightly to stay within its thermal envelope—reviewers note “warm to the touch,” not alarming. And compared with 10K–20K options, the 737’s mass is noticeable in a sling or jacket pocket; many owners accept that trade‑off for performance, while some Reddit threads question whether the premium price fits their use. (techradar.com)

How it stacks up against typical alternatives

Against a mainstream 20,000mAh/65W bank, the 737 often gives you ~10–15Wh more usable energy and the option to fast‑charge larger laptops at full speed, which the 65W class typically cannot sustain. Against budget 10,000mAh/18W models, it’s simply a different tool: those are for phones and earbuds, not laptops. Where the 737 behaves like peers is in multi‑port sharing (one total budget) and airline compliance (<100Wh). If you never charge a USB‑C laptop and rarely drain a phone below 30% in a day, a 65W 20K bank likely wins on price and weight. If you do carry a laptop and value known‑good PD 3.1 behavior, the 737’s headroom translates to less time babysitting cables and more time working. The table below summarizes the practical feature gaps that matter in travel.

Item	Anker 737	Mainstream 20K/65W	Budget 10K/18W
PD 3.1 / 28V up to 140W	Yes	No	No
Under 100Wh (airline carry‑on)	Yes	Yes	Yes
Smart display with in/out watts	Yes	No	No
Trickle‑charge mode (wearables)	Yes	No	No
Fast self‑recharge (>60W input)	Yes	Yes	No
Multi‑device charging (3 ports)	Yes	Yes	No

Anker A1289 manual and support pages; typical competitor specs from major retailers.

Step‑by‑step: getting the best real‑world performance

• Match the charger and cable: pair the 737 with a PD 3.1/EPR charger (100–140W) and the included EPR cable for the fastest self‑recharges and the most stable 28V output. If you must use a 65W brick, expect a slower refill but identical on‑the‑go power. (usb.org)
• Prioritize ports: start your biggest device on USB‑C1 first. Add smaller loads later so the controller’s dynamic allocation doesn’t starve the priority device mid‑charge. (service.anker.com)
• Use trickle mode for wearables: enable it for earbuds and watches to prevent auto‑shutoff on sub‑50mA loads. Disable when you’re done so the bank returns to normal behavior. (lp.ankerjapan.com)
• Mind heat: don’t bury the bank under coats or seat cushions while pushing >60W for long periods. Mild warmth is normal; sustained heat accelerates cell aging. (batteryuniversity.com)
• Calibrate occasionally: once every month or two, run the bank from near‑full to low and back to help the fuel gauge’s time‑to‑empty estimates stay realistic.
• Pack for security: keep a photo of the 86.4Wh label and remember that spares must go in carry‑on per FAA guidance. It saves time at checkpoints. (faa.gov)

Conclusion: does real‑world performance justify the price?

Across tens of thousands of owner reports and expert takes, the consensus is steady: the 737’s combination of usable 86.4Wh capacity, true laptop‑class PD 3.1 output, clear power readouts, and airline compliance makes travel days easier. It is heavier and pricier than midrange banks, and per‑port peaks drop when you light up all three outputs, but the core promise—fast, reliable charging for phones through laptops—holds up month after month. If you value that reliability and you travel with a USB‑C laptop or power‑hungry tablet, the 737’s performance supports the buy. If you only need phone top‑ups, save money and weight with a smaller 65W or 18W model.