How long to charge a power bank 20000 mAh to full Capacity?


Having a power bank with you can be extremely convenient when there’s no extra available power supply. Once your power bank is juiced up, you can use it to charge electronic devices on the go. The capacity of 20000 mAh is a commonly used rate, for a branded 20000 mAh power bank, it’s capable of charging iPhone for 7.5+ times, samsung S6 for 5+ times or iPad mini for 2+ times. One of the frequently question from power bank users is: does it take a long time to get 20000 mAh fully charged?



How long to charge a power bank 20000 mAh to full capacity ?

There is a famous container and tap rule in simple plain layman’s language :

1.Charging a battery with charger is same as filling a container with water. 

2.The time taken to fill the container totally depends on how much water flows through the tap. 

3.There are different kinds of taps and companies that have different taps and water flow. 

4.Depending on this flow the container will get filled at different timing.


In a word, the charging time basically depends on the charger you use. A formula to solve how long to charge a power bank:

Charging time in hours = ( power bank capacity in mAh) /(charging rate in mA) 

Literally there are 2 factors will affect the charging rate : Output of charger ( Tap ) & Input of power bank ( Water Flow )

Currently most power banks are designed with 5V 2A input standard, which stands for the biggest amount of flow it can accept. Theoretically the charger you use to juice up such a power bank should be able to provide 2 A current flow which exactly match the needs. However, considering an estimated 15% power consumption during charging/discharging process, the actual input current would be 1700 mA ( 1.7A ).

Applying the formula above the power bank 20000 mAh rated charging time = 20000 mAh / 1700 mA = 11.76 hours 


Differ from the classical single input port, dual input ports design is applied by EasyAcc 20000mAh Power Bank (Buy At Amazon), which means the charging time is halved to around 6 hours. Another option is OUTXE Savage 20000mAh Rugged Solar Charger 4A Dual Input (Type C and USB) (Buy At Amazon) which is seriously built rugged against water, dust and tumbles, thoughtfully designed for outdoors, additionally the built-in high-effective 2W solar panel offers you a reliable alternative and renewable eco-friendly energy source. ultra-fast output power up to 18W, it takes only 1.7 hours to fully charge Samsung Galaxy S9. It has a 35 hours-lasting strong flashlight, 3 modes includes SOS , it works even underwater. It’s the best power bank for outdoors, solid, reliable and powerful.


Certainly the accessory of dual ports charger is a must-have. 


What if the output of charger is higher than 2A? Does that mean the charging time will be shorter? 

The answer is ” No “, technically the power bank would only draw the current it needs through the charger, even though some chargers can supply higher current, the power bank would only allow 2A flow ( except for higher input demanding power banks ).

Highly recommended Power Bank with 20000 mAh capacity: 

1: Anker 20100mAh Portable Charger PowerCore 20100


  • Certified Safe: Anker’s MultiProtect safety system ensures complete protection for you and your devices.

2.USB C Power Bank RAVPower 20100 Portable Charger with QC 3.0


  • Quick Charge 3.0 Input & Output: 75% faster technology, charge compatible smartphones from 0 to 80% in only 35 minutes; QC3.0 input allows for speedy recharging of the battery charger
  • Type-C Input & Output: Power bank recharges up to 5V/3A; compatible with Nintendo Switch, 12-inch MacBook, Google Pixel 2, Samsung Galaxy S8 / S8 Plus, Huawei Mate 10 Pro
  • Bigger Capacity and Faster Recharge: 20100mAh charges the Nintendo Switch 2.5 times, iPhone X 4.4 times; fully recharge the power bank in just 4.5 hours (QC3.0 charger) or 10.5 hours (5V/2A charger)


How long to charge power bank first time

How Long to Charge 2600mAh Power Bank the First Time


15 thoughts on “How long to charge a power bank 20000 mAh to full Capacity?

  1. Mine is Jaguar Powerbank 20K MAH[input is 2A],I’ve been using a 4 port charger with 4.4A,does this speed up the charging time?


    1. If the charger you use can support 2A output current then the charging speed will be at maximum, it seems like the maximum output of your charger is 4.4A, if so, it can definitely support the largest charging speed at 2A output.


    2. hi, i have a question. can you charge your jaguar powerbank 20k mah with two input cables (one lightning cable & one micro usb cable) at the same time? tia


  2. I have my Jaguar 20000mah, got it from our exchange gift. I would like to know if this is authentic, the codes are 9 83756 72345 7


  3. Power Bank model: PB-T9 .Battery Charger
    White light keeps on blinking. Is it fully charged? Please advise.


      1. I also had PBT-9,almost 14 hours and the powerbank still blinking,is it mean it is still not full.?..please advise..


      2. If it works fine, it’s blinking means it’s still in recharging process. Is it the first time you recharge the power bank? If so, please continue charging it until it stops blinking, if it keeps blinking then there must be some problem with the internal circuit or indicator, you’d better contact the after-sale service for further assistance


  4. Am madly today I received cool but power bank. I charging power bank since two hours. Till it blinking. Unable to charge the mobile device. Kindly help me.


    1. If it works fine, it’s blinking means it’s still in recharging process. Is it the first time you recharge the power bank? If so, please continue charging it until it stops blinking. Obviously, two hours is not enough.


  5. I have a power bank charger model 28126 item number PB102 Capacity 22000mAh lot number 71932 I would like to know when is my charger is charge I have and blue light


  6. I have a Power/CEL that says it is 2200 Ah. I haven’t used it in a while and was wondering how long it takes to fully charge and How do I know it is fully charged. Does it turn Green. It is now Red.


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