Introduction: DIY Power Bank ?

Picture of DIY Power Bank ?

Before Starting if you bored of reading you can check out my YouTube Channel for Full video tutorial.

So lets get started

Step 1: Gathering Parts

Picture of Gathering Parts

List of Parts:-

18650 Li-ion cells


Step up module


Soldering iron

Solder wire


and a bit of Patient.

Step 2: Building the Battry Pack

Picture of Building the Battry Pack

1) Before building the battery pack check that voltage of both the battery it shall be same.

2) I used some hot glue the keep both batteries together you can even use tape or a heat shrinking tube.

3) Solder anode with anode and cathode with cathode of the batteries.

4) Battery pack is complete !

Step 3: Making the Circuit

Picture of Making the Circuit

1) Connect the cathode of battery to -ve terminal of TP-4056 and the step up module.

2) Then connect the Anode of all three as shown in the 3rd image.

3) Then adjust the output of step up module to 5V using the potentiometer

4) And at the end connect output of step up module to USB port.

Now you can charge your Mobile but ........

Step 4: But.....

Picture of But.....

You can use this circuit if your mobile uses less than 700ma

but I have an idea for that !

Step 5: Problem Solved ?

Picture of Problem Solved ?

I used an pcb from old power bank which claim to have capacity of 10000mAh hahahahahahahaha not funny :p


Use this DC 0.9 - 5V , 3V To 5V USB Charger Step Up Module Mini DC-DC Boost Converter

Step 6: Final Step!

Picture of Final Step!

1) I removed all the SMD LEDs and the Push button.

2) Then I soldered 5 mm white leds and a push button on the new wires.

Step 7: Congratulations !

Picture of Congratulations !

Okay now our power bank is complete :)

dont forget to give it a thumbs up and do check out my YouTube Channel


SushantG8 (author)2017-12-13

What is this 18650 cell ...
Insted of it Can i use my old mobile battery which is 3.8li polymer battery and 9.5Wh

iabir (author)2017-07-22

any idea what is usage of the coil made with copper wire in the pcb?

narga (author)iabir2017-07-24

its secret hi tech black magic stuff, but basically, if you have step up converter, coil + capacitor serve as "storage" for amplified voltage before its send to output, and yes, it must be there

ahmadel.sayed.5832 (author)2016-08-15

Very nice

magnetomax (author)2016-07-27

Thanks for the idea!
Can I attach more batteries in parallel? Will it affect the charging module?

Nematic! (author)magnetomax2016-07-27

Yes But charging time will increase by number of batteries attached one battry takes about 3 hrs to charge so dont freak out when you get high charging times its just normal

PhilKE3FL (author)2016-07-08

Very nice, might also want a step down converter and remember, some 18650 cells have built in current limiting and any up/down converter also has a current limit which may, or may not, limit the useful current even more.

Oh, just a friendly word hint, the English language is a real "pain" we have many words that sound alike and are spelled differently and mean different things. A real good example is, to, too, and two for one. :) The word "Patient" is a person under a doctor's care. The word you wanted to use was "Patience" meaning a person is tolerant, able to handle disappointment and continue.

Thanks again for posting your instructable! Also, your use of English is far better than mine would be of your language, please continue to post & expand you knowledge both of electronics and the painful English language. (Which most of us who speak English as a first language still mess up as well!)

Nematic! (author)PhilKE3FL2016-07-08

Mine don't have inbuilt circuit protection. And thanks for telling mistake of Patient word. Actually Doing youtube and video editing is pain so some times I do mess up with it when tired

RichM5 (author)2016-07-07

Nice work, I've been thinking about turning a large pile of excess 18650s I have into new guts for an old powerbank. Nice to see it already done. I'm going to use an aluminum project enclosure (and very careful isolation/shielding) to make mine a little more robust.

Thanks, good 'ible!

billbillt (author)2016-07-07

This is a wonderful project!!.. Thanks for sharing!....

marc1 (author)2016-07-07

Did you ever try to write in a foreign language yourself.

At least he's an enthusiastic person who makes something.

You have probably two left hands and you are jealous of him.

fstedie (author)2016-07-07

I used to think the same thing but realized that Instructables has users from all over the world. Kudos to them for actually trying to share their knowledge in English (which BTW is the absolute worst language to learn - with more exceptions than rules).

Now, if the actual NATIVE speakers would learn proper spelling and grammar - that would take us a long way!

PeterA18 (author)2016-06-29

All protection can damage your phone dude

Errol1951 (author)PeterA182016-07-07

If they are good quality batteries they should have built in protection but if they are cheap chinese batteries it would be good to have a dedicated usb input with the necessary protection in it

dasimpson1981 (author)PeterA182016-06-30

as long as the boost circuit is set to 5.2 volt they will be no damage and protection cirsuit is only needed for the first idea to stop over discharge

Nematic! (author)dasimpson19812016-07-01

on my board there is TSP 2511 so i dont need to worry but second option needs to be worry

dasimpson1981 (author)Nematic!2016-07-01

i only so the first half with the charge controller and the boost converter i had not scene the part of this tut where you use the salvaged unit so all my comments where to the diy unit not the salvaged unit

Nematic! (author)PeterA182016-07-01

The board which I am using is having TSP 2511

check the data sheet . yes if you use the second one you will damage cells.

Nematic! (author)PeterA182016-06-29

The board which I am using is having TSP 2511

check the data sheet . yes if you use the second one you will damage cells

jerry.ericsson2 (author)2016-07-07

I have a couple that I built, not to output to USB but with plugs that accept standard cables. I have one step up and one step down. Each are powered by three 18650's and have adjustable power converters with meters attached. I have them in clear cover project boxes and use them almost daily in my projects, much better then a large 110 volt power supply that you need to have near plug ins. I take mine along on our winter excursions down south to avoid the snow and cold, that way I can keep up my electronics hobby in the Arizona desert as well as on the plains of South Dakota.

dasimpson1981 (author)2016-06-30

they dont hald make some bold claims about capacity on these battery banks i had a few claim to be 20000mah and or only 2000 mah

Nematic! (author)dasimpson19812016-07-01


dasimpson1981 (author)2016-06-27

you have no protection circuit for the cells so they is a very good chance you could over discharge the cells and kill them

Nematic! (author)dasimpson19812016-06-29

The board which I am using is having TSP 2511

check the data sheet . yes if you use the second one you will damage cells.

dasimpson1981 (author)Nematic!2016-06-30

i was refering the the li-ions charge circuit and boost circuit not the salvaged board from battery bank

ceaf2014 (author)2016-06-29

kid i have a problem with a power bank, it claims to be of 50.000mAh when i plug the cable for charge it the led blinks like if its charging but its not working it dosnt charge, i open it up and is missin a Coil so the problem can be because of that right? if i solder a new Coil it will work fine??? im really instrested on this and im waiting for your answer!! thanks!! from Venezuela

Nematic! (author)ceaf20142016-06-29

Yea try that out if that does not work but the module which i have shown


DIY Hacks and How Tos (author)2016-06-26

Cool power system.


About This Instructable




Bio: Hi, I'm Nemeen !, Electronic and robotics enthusiastic. This is my channel 'Nematic !' I will be uploading on and about awesome Electronics Tutorials, Projects and ... More »
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