Anker 737 Not Charging | Fix It In 10 Minutes

Know What “Not Charging” Means On Anker 737

The name “Anker 737” gets used for two different products: the 737 Power Bank (PowerCore 24K) and the 737 Charger (GaNPrime 120W). “Not charging” can mean the power bank won’t accept power, or it can mean the wall charger won’t power your phone or laptop. Start by naming the symptom, because the fix changes with the direction of power.

If you’re dealing with the power bank, the screen is your best clue. When it’s taking power, you should see an input watt reading that stays steady after a few seconds. If the number flashes, drops to zero, or never shows up, the issue is usually the cable, the wall adapter, the port, or the negotiation between them.

If you’re dealing with the wall charger, watch your device instead. A laptop might show “plugged in, not charging,” a phone might bounce between charging and not charging, or a device might charge but at a crawl.

Common Patterns That Point To The Cause

What You Notice	Most Likely Reason	First Thing To Try
Power bank shows 0W input	Cable or adapter can’t do USB-C PD	Use a 100W+ USB-C PD charger and a 5A e-marked cable
Input starts then stops	Handshake glitch or port debris	Unplug, wait 30 seconds, clean port, try again
Charger works on one port only	Port sharing or a worn cable	Test one port at a time with a new cable
Device says “not charging”	Device limits, heat, or low power mode	Cool it down, close heavy apps, try a different port

Anker 737 Not Charging Checklist Before You Reset

Most charging failures are boring. That’s good news. A short checklist saves you from chasing the wrong fix, and it also helps if you end up filing a warranty claim.

A solid baseline is one charger, one cable, one device only.

• Use A Known-Good Outlet — Plug straight into a wall outlet, not a loose power strip or a travel adapter that wobbles.
• Swap The Cable First — Grab a USB-C to USB-C cable rated for 100W or 240W with an e-marker; many thin cables cap power and drop the handshake.
• Try One Device Only — Disconnect everything except one device, then test again so port sharing can’t confuse the result.
• Check Port Direction — On the power bank, one USB-C port is often used as the main in/out port; try both USB-C ports for input to rule out a port fault.
• Watch The Screen Or Indicator — Let the reading settle for 10 seconds; a stable watt number means the connection held.
• Let It Cool Down — Heat can trigger protection; set the unit on a hard surface and wait until it feels normal to the touch.
• Remove Lint And Dust — Gently clear the USB-C port with a dry wooden toothpick or compressed air; a single fiber can stop a clean fit.

One more thing trips people up. The 737 Power Bank can pull high input only from a real USB-C Power Delivery source reliably.

A USB-A wall brick with a C cable on the end often behaves like a low-power source, so the power bank may refuse, cycle, or charge slowly.

Anker 737 Won’t Charge Through USB-C When Everything Looks Fine

When the cable and wall adapter are decent and the connection still fails, you’re usually looking at a stuck controller state. Power banks and USB-C chargers both negotiate voltage and current. When that negotiation glitches, the device can get “stuck” and keep saying no even after you replug.

Do The Cable-Loop Reset On The 737 Power Bank

This reset is odd, yet it’s widely recommended for the 737 Power Bank. It forces the controller to renegotiate by creating a brief internal loop.

1. Unplug Everything — Disconnect the power bank from chargers and devices.
2. Use A Usb-c To Usb-c Cable — Pick a decent C-to-C cable, not an adapter chain.
3. Connect Both Ends To The Power Bank — Plug one end into one USB-C port and the other end into the other USB-C port.
4. Hold For 3–5 Seconds — Keep both ends connected for a few seconds until the screen wakes or the percentage shows.
5. Charge Then Discharge Once — Charge the bank, then use it to charge a device, then charge it again.

If the power bank was stuck, this often brings it back. If nothing changes after two tries, move on to the checks below.

Let The 737 Charger Reset Itself

On the 737 wall charger, a simple “no power for a bit” reset can clear odd behavior. Unplug it from the outlet, unplug all cables from the charger, then leave it alone for about five minutes. After that, plug it back into the wall and test again with one device.

Fixes When The 737 Power Bank Won’t Take A Charge

If your power bank shows no input or stops charging after a few seconds, work through these checks in order. Each step is meant to isolate one variable at a time.

Confirm You’re Feeding It Real USB-C PD Power

The 737 Power Bank can accept high wattage input, but only if the source can speak USB-C Power Delivery. A laptop-class USB-C charger is the simplest test. If your wall adapter is rated for 30W or less, charging might still work, yet it can be slow and easier to interrupt.

• Try A 65W+ Charger — A higher-power PD charger is more stable during negotiation and tends to hold the connection.
• Use A 5A Cable — The cable matters as much as the charger; a 3A cable can bottleneck and confuse watt readings.
• Avoid Usb-a Bricks — USB-A ports can’t deliver USB-C PD profiles, even if the cable end is USB-C.

Check For A “Low Current” Mode Mix-Up

Some units offer a low-power mode meant for earbuds or watches. If that mode is on, your phone or laptop may behave oddly and you may think the bank is the one failing. On many Anker power banks, a double press of the power button toggles this mode. Toggle it off, then retest with a phone.

Test Both Usb-c Ports As Input

A worn port can feel like a charging problem even when the battery cells are fine. Try charging through each USB-C port, then note whether one port holds input better than the other. If one port is flaky, keep using the good port and treat the other as suspect.

Rule Out A Device Backfeeding Problem

Some laptops and hubs can feed power back in ways the power bank doesn’t like, which can stall charging. To test this, charge the bank with nothing connected to its outputs. Once it’s charging steadily, connect your device and see if the input drops. If it drops, your device or hub is the trigger.

Use A Clean, Simple Charging Setup

• Plug Directly Into The Wall — Skip travel adapters and power strips for the test.
• Skip Magnetic Tips — Add-on magnetic USB-C tips can loosen the fit and break negotiation.
• Keep Cables Short — Long cables can add loss and heat, which can lead to cycling.

Fixes When The 737 Charger Won’t Power Your Devices

If your wall charger is the issue, the pattern is different. A charger can appear dead when it’s reacting to a cable fault, a loose outlet, or a device that keeps renegotiating power. Work from simple to specific.

Isolate The Port That’s Failing

• Test One Port At A Time — Plug one device into one port, then repeat on the next port with the same cable.
• Use The Same Device — Switching devices mid-test can hide a device-side limit.
• Watch For Cycling — If charging starts and stops, the cable, connector fit, or device handshake is the likely trigger.

Use The Right Cable For Laptops

A phone can charge through almost any cable. A laptop is pickier. If you’re charging a laptop and it says “plugged in, not charging,” swap to a cable labeled 100W or 240W and test again. If your laptop has multiple USB-C ports, test another port on the laptop too.

Check Multi-Port Power Sharing

On many multi-port chargers, plugging in a second device changes how power is split across ports. Your laptop might drop from fast charging to slow charging, which can look like a failure. For troubleshooting, charge only one device until you see steady behavior. Then add the second device and watch for changes.

Let Heat Protection Do Its Thing

Fast charging at high wattage can warm the charger. If it gets hot, it may reduce output until it cools. Place it in open air, keep it off beds and couches, and avoid bundling it under other gear while testing.

If your phone charges fine but your laptop doesn’t, it may be a watt mismatch. Some laptops want more than a small phone-class adapter can give. The 737 charger can supply high power on the right port and with the right cable, so the test that matters is one laptop, one USB-C port, one high-rated cable.

When It’s Time For Warranty Service

If you’ve tried a known-good outlet, a high-rated cable, a real USB-C PD charger, and the resets above, you may be looking at a faulty port, damaged board, or worn cells. At that point, more tinkering can waste time.

Before you reach out to Anker’s warranty team, gather proof and make the problem easy to reproduce. Clear notes speed up the back-and-forth.

• Write Down The Model — Note whether it’s the 737 Power Bank (often listed as A1289) or the 737 wall charger.
• Record The Symptom — “No input wattage,” “charges then stops,” or “only one port works” is more useful than “broken.”
• List Your Test Gear — Include the charger watt rating and the cable rating you used.
• Take A Short Video — A 15-second clip of the screen or device behavior can settle questions fast.

If your unit is new and never charged correctly, treat that as a defective-out-of-box case. If it used to work and then changed after a drop, a bent connector is common. If it fails only in one specific setup, like through a hub, mention that too.

Finally, once you get it working again, keep the setup simple for a week. Use one proven USB-C PD wall adapter and one good cable. That single change prevents most repeats of anker 737 not charging, and it makes it easier to spot a cable that’s starting to fail.