DIY Power Bank ?





Introduction: 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

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

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

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.....

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

but I have an idea for that !

Step 5: 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!

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 !

Okay now our power bank is complete :)

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



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Please be positive and constructive.




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

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

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

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

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

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!)

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

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!

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