How to Repair Power Bank?

By August 10, 2016

Normally the electronic devices like smartphones and tablets need a back up power bank to keep them alive, most of us individually owns even more than one. However, not all of us know how power bank works literally and how to repair power bank when it’s not charging or other defects occur.

power bank not working

I compiled some facts gathered from different causes and practical approaches to fix the problems with easy-to-use tools.

Generally there are 3 types of problems commonly encountered by the users:

1.Broken indicator

2.Not charging

3.Loose USB port

Let us get to solve the items one by one.

How to repair power bank with broken indicator?

Instead of using the word “repair” actually ” apply properly” is more suitable. Why? If the indicator is not functioning, then there’s a good chance that the charging circuit or the voltage converter might be defective, or the batteries will simply no longer accept charge. Therefore, the first thing on your to do list is to make sure the charging function is still working which means only the indicator failed, it’s not a brilliant choice to open the case and repair the batteries or circuits for most users, unless you have solid electronic knowledge background.



Simply apply a USB meter to measure the power passing through is a safe way to know the power bank is fully charged or nearly empty. The operation is easy enough, just charge your power bank and connecting it to the charger through the USB meter, keep an eye on capacity passed to, if it stops increasing, then charging is probably done. This option is also good to tell if battery capacity has decreased or to verify if the power bank you just bought really got the capacity it claimed to be. 

How to repair power bank which is not charging?

If your power bank is made with Li-Ion 18650 batteries, when it is not charging it’s possible that the charging circuit is broken but the batteries are still good to use, or some of the batteries are still working, if so, you can still use the batteries to DIY a power bank, the methodology is similar to the article how to build a power bank from used laptop battery , just replace the used laptop battery to power bank battery, they are pretty much the same thing – 18650 batteries.

What if all the batteries are already dead? In this case it’s better to buy a new one, the printed circuit board is not easy to be fixed.

How to repair power bank with loose USB port?

Applying solder is not a good idea for amateurs, I would rather introduce an easier way for it, all you need is a screwdriver or even a toothpick, make the process as simplest as possible,the details are declared in the video below.

If your power bank is not fixed by applying the methods above, I strongly recommend to get a new one for safety concern.

High-quality power banks recommendation:

1. Anker 20000mAh Portable Charger PowerCore 20100

It’s a ultra High Capacity Power Bank with 4.8A Output, PowerIQ Technology, perfect combination of portability and durability, furthermore it’s the best seller at Amazon. 


2. EasyAcc 20000mAh Portable Charger Fast Recharge

The unique dual port input save 50% recharging time, it supports 4.8A Output with 4 USB Ports. Auto detects and changes its charging speed unique to your device for high charging speed up to 2.4A, it’s a good companion for multi-device users.



how to build a power bank from used laptop battery?

What Should We Do If Power Bank Not Charging?

Comments (23)




  1. My powerbank which is of intex. 11000 mah. When i charge it it gets charged soo quickly within 20 minutes, and when i connect to my phone, it also gets discharged very fast, i can just charge my phone about 10 percent max, i have a 2600mah battery in my phone!…what can be the reason, is my powerbank dead?

  2. How to buy powerbank pcb
    I want 3port usb pcb is it available

  3. Hi my powerbank cant charge.

  4. My dulla m500000 won’t charge my phone but when i plug it to wall its works can yall please tell me how to fix it please

  5. Hi! My powerbank is Anker 2nd Gen Astro E7 and it got wet with sea water 🙁 it’s not functioning well now. Like it won’t turn on right away (you need more luck before it turns on) and the flash light is also not working anymore 🙁 and when I plug it in to charge and plug my phone to the Anker it won’t charge anymore 🙁 I haven’t used this days after it got wet and dried it in dry rice however it’s still not fixed 🙁 should I bring it to the anker center or any DIYs I can do to save it? Tho it’s a bit heavy compared to other Powerbanks I still love this one! It’s very useful and can last for weeks! I hope someone can help. Thank you!

  6. My power is indicating of charging but it doesn’t indicate about fully charged or increasing the percentage of charging in led light? Please reply as soon as possible

    • If the indicator keeps blinking after a long-time recharging, try to switch the charging cable and charger then find out if it’s the problem with the charging accessories or the power bank.

  7. my powerbank light is just flashing and it won’t charge my phone

    • If all the lights are flashing then stop, I wonder the power bank is running out of juice, you need to recharge it first. If the lights cannot stop flashing, I’m afraid it’s the problem with the internal circuit, you’d better contact the customer service for assistance.

  8. HI My powerbank charging port is broken i cant charge my powerbank because of that. The charging port is i think have 6 pins something like that but i only have 4. Its really sad and i dont know how to repair or something. I hope someone will help me on this

  9. power bank display showing charging in also lighting when connected to power source but the battery percentage not increasing…still it is charging the phone .please tell me, what would be the problem.

    • Hi, if the power bank cannot be recharged successfully, I doubt it’s the defect with the internal Lithium battery, it can only discharge power but not get recharged. I suggest you to contact customer service for further assistance.

  10. Hello, please what can I do to make my power bank start charging my phone again. I’m using new age power bank with 13000mAh. I bought it few weeks ago and I charged it with another new age power bank last week because there was no other source of power at that time and since then it has been malfunctioning gradually and now it’s not charging my phone again and the indicator light is always on even without anything being connected to it. Please what can I do. I would really appreciate it if you can help. Thanks.

    • Hello Debbie, if the problem occurred with your new age power bank, I suggest you to ask for an exchange since it’s still under warranty, because the tear-down and fix on your own would be the last option if you don’t have solid background knowledge and as you mentioned the indicator is always on, there must be something wrong in the loop internal.

  11. My power bank is fully charged but discharges when i connect my phone to it. Any solution?

    • Hi,if you mean when you connect your phone to the power bank and the power loss is larger than the battery capacity of your phone, technically if it’s about 20% power loss throughout charging process that’s quite normal as the charging efficiency of industry standard is pretty much 80%.

  12. My power bank is fully charge
    But it does not charge my android phonr

  13. Thank you for this wonderful post I appreciate it.