How to Fix the Issue: Power Bank Blinking But Not Charging

The power bank flashes but cannot be charged if it has a faulty charger, the plug is broken, or the battery is damaged. But there are many different things that can also cause this problem.

Power banks can be a real lifesaver, but sometimes they can also give us headaches. One of the most common problems with portable chargers is that their lights flash in a certain pattern, which is not easy to understand.

LED indicator lights and their functions

Most power banks have 4 small LED operating indicator lights that provide information about the state of charge of the battery.

Normally, when you plug a power bank into an outlet to charge it, one of the LED lights will flash, indicating that the power bank is accepting a charge. As the image shows, each of the LED lights indicates the current charge level of the battery:

  • The first flash means you have between 0% and 25% charge
  • The second blink means the charge level is between 25% and 50%
  • The third flashing light means you have between 50% and 75% charge
  • The fourth flash means it has between 75 and 100% charge.

These lights usually blink while charging. They also flash when you want to check how much power is left by pressing the power button, a feature almost all power banks have. When you see 4 solid LED lights, it means the device is fully charged.

How can I Check the status of the power bank?

For example, the flashing LED light indicates a different charge level

  • Dim green light: Less than 80% charged
  • High green light: 100% charged
  • Medium green light: more than 80%
  • Flashing red means error; loading error
  • All 4 lights will flash, which means the remaining charge is between 75% and 100%.
  • 3 flashing lights mean there is between 50% and 75% charge left.
  • 2 flashing lights mean there is between 25% and 50% charge left.
  • Just 1 flashing light means 0-25% charge remains.
  • At this point, you should unplug the mobile phone and prevent the power bank from discharging completely, as this may damage the battery, especially if this happens repeatedly.

What to do if the power bank died

If you check that everything else is OK and confirm that the power bank has a problem, here’s what you can do.

  • Please check the warranty and contact the supplier for a solution if it is within the warranty period. (12-36 months)
  • Contact your local electrical store if the warranty has expired. In most cases, the workshop can fix the problems.
  • There is no solution after doing the above 2 steps. Simply throw away your power bank. But please ecological.

Why the LED lights flash but the power bank does not charge

The power bank may run out of power after several hours while the indicators are flashing. You check it and everything seems to be fine, as usual when you load there.

Charging adapter problem

The adapter may not work or the charge level may be too low. Try another adapter to see the result. Replace if it works.

Power cord problem

1.1 It may be the cable connection problem. Just check that the socket is seated properly and that there is no dirt inside.

May 1,2, the cable can not bear the load. You can only use the cheap lines a few times. Or it doesn’t support fast charging because power banks are required.

Power supply problem

The computer charging current is 0.5A. Try charging the power bank from a wall outlet.

Power bank problem

The power bank may have an internal error after a strong impact or a long stay in a hot environment. Or the battery life is expired if you have used it for 300-1000 power cycles (different brands and models vary).

What to do if your battery is damaged?

If you are sure that there is no other reason why your power bank is not charging, you should replace the damaged battery. This is what you need to do:

  • Check the warranty – If you bought the power bank from a reputable brand, chances are it has some sort of warranty. Usually, the warranty is 24-48 months. If your power bank is still under warranty, please contact the brand as they can replace the battery for free.
  • Send it in for repair: If it is out of warranty, you should send it to a local electrical shop. They usually fix the device within a few hours. You could replace the battery. The new battery is not as powerful as the original battery, but it will cost less.
  • Buy a power bank new: If you don’t want a cheap battery or the repairman couldn’t fix the power bank, all you have to do is buy a new one. You must dispose of your old power bank properly. You can usually find specially made rechargeable battery bins near electronics stores, you can throw the power bank in there.


if your power bank is blinking but not charging, there are a few potential causes. First, check to make sure that the device is properly connected to the power source. If it’s not, try another outlet or try a different USB port on your device. If that doesn’t work, try replacing the power bank. Finally, if all else fails and your power bank still isn’t charging, it may be time to get a new one.

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