Introduction: Power Bank

Picture of Power Bank

Hello! friends

Welcome to my another rechargeable power bank. In this project i'm gonna show you how to make your own power bank by using car charger.

So let's get started.

Step 1: Circuit Diagram

Picture of Circuit Diagram

With the help of this circuit diagram we can build our own power bank.

If you are using simple 9 volt battery you just follow the second picture of circuit diagram.

If you are using rechargeable battery then follow the first picture of circuit diagram.

Step 2: Material

Picture of Material

You'll need

A car charger

9 volt recharable battery (but i'm using simple to just show you)

9 volt battery jack

Switch spst

1n4007 diode

330 ohm resistor

Red led

Female pin connector

Data cable

Jumper wires

Hot glue

Step 3: Disassemble

Picture of Disassemble

Open your car charger very carefully and take a circuit from it and remove the all other parts.

Step 4: Soldering

Picture of Soldering

Take a circuit board of car charger and soldering the +ve and -ve with piece of wires.

Step 5: Making Holes

Picture of Making Holes

Make some holes according to your fitting.

Step 6: Fitting

Picture of Fitting

I'm just using simple 9 volt battery (don't plug the charger) but i replaced it with recharable 9 volt battery later. Fit the all components in a box make sure all connections are working properly according to the circuit diagram and put some hot glue on a components. Now your power bank is almost ready to use.

Step 7: Finish

Picture of Finish

Now connect the data cable with your power bank and then connect the other side of the data cable with your smartphone push the button "ON" you can see charging is started of your phone.

Another benefit of this power bank is you can also connect your usb internet device (Wingle) with it.

I hope you guys like it.

I'm sorry about previous pictures its really dangerous. I never connect a li-ion battery in series again. If i need to connect a li-ion cells in series i definitely use a balancing circuit with it. I really thanks to my instructables friends they were help me alot show me a right path of using li-ion battery.

Again thanks you guys are awesome......;)


Jboneymyhomie (author)2015-09-30

how would you recharge the 3x18650?

Jboneymyhomie power bank required to 12 volts for charging.

This is a dangerous way to attempt this with the circuit you've provided. When charging Li-Ion or Li-Po batteries in series, you must include a balancing circuit and supply only 4.2v max to prevent overcharging and/or overheating your batteries.

Battery packs that contain multiple cells in series (such as laptop batteries) have the balancing circuit and everything else built in to them.

You could always charge them one at a time, but you'd still need to keep an eye on them using a voltmeter to ensure they didn't overcharge.

Be cautious with these types of batteries, they can explode and burn you or your house down if you're not careful.

billbillt (author)kaddigart2015-10-04

Don't let the CyberSafetyNannies deter you from sharing great projects such as this... They are always around ready to piss on your ideas..

static (author)billbillt2017-04-07

Go away troll, please...

billbillt (author)static2017-04-08


kaddigart (author)billbillt2015-10-05

In no way did I try and deter him from sharing his project, I simply tried to warn him of the dangers he could face. It's a great project to learn the ins and outs of batteries, charging and so forth. Maybe he'll get lucky and manage not to hurt himself, maybe not. A balancing circuit would ensure that he didn't. Sharing this is how you learn, and sometimes people offer advice in order help it progress. That is what the site is all about, yes?

Before mud slinging and name calling you should have working knowledge of the topic at hand. Don't take my word for it, Google "charging li-ion batteries in series" and see what you come up with. Maybe then you can actually contribute to the discussion instead of coming off as childish and ignorant. The CyberSafetyNannies could possibly save you from a trip to the emergency room, or at least give enough pause to research a little in contemplation before charging blindly ahead.

marcust13 (author)kaddigart2015-12-09

That IS trying to deter him

static (author)marcust132017-04-07

No that was respectful warning to those who might duplicate something that is faulty in design and is very real hazard. In the event that would deter someone from posting their projects, they are to thin skinned to be posting in the first place. Perhaps you may do well to be quit and learn from those who could teach you something. As the person who posted this projectdid, as any intelligent person would. Kudos to the author for being one of those intelligent persons and editing their post

marcust13 (author)kaddigart2015-12-09

That IS trying to deter him

marcust13 (author)kaddigart2015-12-09

That IS trying to deter him

billbillt (author)kaddigart2015-10-05

I stand but my original post...

daniellong2 (author)billbillt2015-10-05

it's a good idea, but needs some modifications so it doesn't blow up in your face

kaddigart thanks for updating me i like to make a circuit of balance charging fix it with my power bank in next version.

LawrenceH8 is just overreacting

bremus (author)Asadullah Mughal2015-10-04

Cool, as long as you're aware of the dangers.

LawrenceH8 (author)kaddigart2015-10-04

DANGROUS is an understatement! Under no circumstance should you use LI batteries! Nicad (poor choice) or NiMh would be OK with a #47 bulb as a current limiter (6.3volt 50ma).

bremus (author)kaddigart2015-10-04

I also don't see any type of balancing connections for the batteries. This is a dangerous instructable.

AviationMetalSmith (author)2015-10-04

I tried this, and the charger disintegrated halfway through step 4.

Then that was a charger that probaly wasn't safe to use for it's intended use. Baran bi cgargers should feft in the bin

Chiranjeebmohanty (author)2017-04-05

can i use a 11.1v battery

SHAMAL 2013 (author)2016-12-03


i'm qute new this stuff so just need to fix this up.

i have 6 laptop batteris and i just need to build power bank. can i use car charger for this...? i mean as a TP-4056....

plz help

yes you can :)

TeddyK12 (author)2016-11-28

I made it without a rechargeable battery!

ABDUL902 (author)2016-07-27

how ot connect the charging port plz help

Shilu Blog (author)2016-06-21

while changing how should I keep the switch either on or off pls reply

simply push to 1 is on and 0 to off btw what do u mean i can't understand

cjma768 (author)2016-03-04

I have a spdt switch. Could I use that instead of the spst switch?

Asadullah Mughal (author)cjma7682016-06-21

yeah why not

alexh147 (author)cjma7682016-04-03

it should be the same

asghark4 (author)2016-02-25

Very good circuit

Dharmil Desai09 (author)2016-01-23


1570525 (author)2015-12-13

Could you use rechargeable 4.7 volt 4200 mAh batteries? Obviously, making changes to the original circuit. Is it possible?

Asadullah Mughal (author)15705252015-12-21

1570525 definitely no. Circuit required minimum 9 volt or maximum 12 volt.

StuartB4 (author)2015-10-02

By the time you've purchased all the parts plus the rechargable batteries you may as well buy a complete unit from China. It'll look a lot better as well :-)

StuartB4 yes i know but if you have useless things you can combined it and make something new like i do. Btw why am i order complete unit from china we have a brain and you'll need to use it. Just imagine if i buy the all things from china + you need to pay some taxes and much more so at the end total cost is doubled or tripled. Whenever my total cost for this project is less than 5 to 6 $.......XD. Think about it.

I like to make something new and as well as instructables teaches us like these types of projects or gadgets. Okay dear i hope you'll understand.

I got a power bank for 2$

Well said reply...

Actually you tend to assume a little too much. I'm all for experimentation and DIY, I wouldn't be here otherwise, but when, as a few others have mentioned, a circuit is unsafe I definitely wouldn't be listing it in a public place. By all means use it yourself and enjoy using it, but please keep your thrown together handy work to yourself. I honestly don't see this as something suitable for Instructables, sorry.

I do actually have a brain and it's constantly being used, the very reason I made the previous comment regarding it being more advantageous to simply buy a power bank. Here in Australia we pay no customs or tax fees as yet and therefore it's much better to buy a completed and safe unit elsewhere. In fact I've purchased 3 excellent power banks from China, all for under $20 AUD or $14 USD. Just the safety factor alone warrants the purchases.

Finally may I suggest you avoid using "Google Translate" I realise your native language isn't English, but asking a friend who understands the English language to translate for you tends to make your comments much easier to understand. Please don't take this as an insult, I've been referred to as "Dear" by Chinese users of the translator as well :-)

Yes making things is great, however this project is Factually an accident waiting to hurt or kill. Contact me Change Li to NiMh, add a series diode and current limiter (#47 bulb) and you'll have an OK project zero switches needed, SAFER too! :=)

Dombomb123 (author)2015-10-28

that Cool!!

im going to try to make it!

KhawajaU1 (author)2015-10-08

Bro where you put other end of white cable

KhawajaU1 its ground (-ve)

CosminA1 (author)2015-10-04

I've just built a circuit for recharging 3 li-ion cells with only one tp4056 charge controller. It only involves two six pin switches like these, and a charging module like this The idea is to use the switches to go from 3S to 3P. Charge in 3P and discharge in 3S, this way you don't need balancing. A picture of the circuit is attached.

kaddigart (author)CosminA12015-10-05

That's a pretty good idea, simply switching from series to parallel. Seems like somebody did this in an eCig mod that I read about...anyway, it's a bit easier to comprehend than a balancing circuit, and easier to wire. I built a portable air cooler that this would be perfect for; up to now I've been removing the cells and charging them on a dedicated charger. Be nice to just plug it in...

CosminA1 (author)kaddigart2015-10-07

if i'd only known that somebody else already did that. Could have done without the head scratching.

CosminA1 thank you very much for sharing this balancing circuit.

CosminA1 thank you very much for sharing this balancing circuit.

ZiddiK (author)2015-10-06

be careful, there's no adequate circuit in this to block high voltage that can blow your phone up. just a 330 ohm resistor used and that is nof enough, warning

Asadullah Mughal (author)ZiddiK2015-10-07

ZiddiK look 330 ohm resistor is only connect with indicator led.

About This Instructable



Bio: I am a student of BSCS but I'm interested in electronics that's why I would like to think about innovative ideas and try ... More »
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