Introduction: Rechargeable (homemade) Power Bank (super Easy)

Picture of Rechargeable (homemade) Power Bank (super Easy)

Step 1: Intro

Picture of Intro

This is my first tutorial so go easy on me xD. Ok I made this charger because tired of being with out music (ipod) on school.because my school does not have power plugs.

Step 2: Partss!

Ok we need: 3x ultrafire 3.7v batteries or 3x 4 volts batteries 1xcar cell phone charger 1x toggle switch Pair of cables 1x rca female plug (you will see its use later) Tools: Hot glue Scissors Black tape Pliers

Step 3: Building This

Picture of Building This

Now comes the good part.connect the 3 batteries in series if they are 3.7v they shoud give 11.1v take apart the car charger.connect positive cable of batterie to center stem of the toggle switch.then connect the negative cable of the battery to the car charger and the rca female plug.connect the car charger positive cable to the right stem of the toggle switch and the positive cable of the rca female plug to the left stem of the toggle switch.

Step 4: Done

My name is Caleb Escobar Ríos from Puerto Rico.I hope this is of help to you.this is my first Instructable tell me how I did and comment if you dont understend or need help.thanks


AdeyemoO (author)2017-03-12

It need 11.1v and above to charge properly

rgupta53 (author)2015-01-19

how i charge it?

SlambourL (author)rgupta532016-11-23

cant wait for this question to solve

Calebescobar11 (author)2016-11-19

search me on facebook as Caleb Escobar and shows me your project

Calebescobar11 (author)2016-11-19

JunJunA2 You can use this as your project but be careful

JunJunA2 (author)2016-11-19

Can I use your idea of making a power bank for my Science Investigatory Project? And of course if you agree I'd give you credit for part of my work since it's just the idea of building it is the only part that I'd like to use. Is that fine with you? :)

pbrammann (author)2016-10-20

Brilliant! A proper regulator, modified calculations....
A simple if not rudementary guide for energy cells. Good work!

Mumtaz Raeza DMA Taeza (author)2016-10-16

I'll try to do it.

Calebescobar11 (author)2016-10-18

Bros and sis don't make this it could be dangerous because most 18560 batteries are not protected. I made this in a time that I was 12 and didn't understand much about the dangers of li ions. Hope nobody got hurt. Go search for another tutorial, this is no good.

PushpithaD1 (author)2016-08-26

And how to find 5 V voltage regulator at home

PushpithaD1 (author)2016-08-26

How to make power bank for 4000 milliampere battery

AmolS15 (author)2016-08-21

I think something's will go wrong, as you are connecting cells in series so its voltage will increase current will be same i.e. capacity is 2200mA but rate of charge flow will be triple. I think you have to connect cells in parallel to improve capacity to 6600 mA and voltage will be acceptable to charge mobiles..

KaushalV (author)AmolS152016-08-24

its not in series bro look at first

TrueB2 (author)2016-04-24

What its capacity ?

tanef (author)TrueB22016-07-21

The capacity of an individual li-on of this type and size is more or less 2200mAh. In a series of three, the total comes out to around 6600mAh.

TonyC166 (author)tanef2016-08-15

Series ups the voltage, not capacity.

Parallel ups the capacity, not voltage.

ArijitD6 (author)2015-10-31

Instead of rca for charging can't we add a microusb port ?

tanef (author)ArijitD62016-07-21

You WILL need a board to handle the power input. In fact, I'm pulling one out of a defunct power bank, removing the need for such things.

However, DO NOT TRY THIS. I cannot stress this enough: it can be dangerous, even with the RCA port. If the batteries are not protected, or if the voltage is not properly regulated, bad things happen.

KrishnaD17 (author)tanef2016-08-14

Can we use a zinner diode to avoid voltage fluctuations?

shivams123 (author)2016-07-30

And how to recharge ...and with how much voltahe as the rca is direcltly connected to batteries?

shivams123 (author)2016-07-30

What is approx charging time of whole setup....and confrm i can recharge it through rca female usb port?

JanR31 (author)2015-12-02

so what is the capacity(mah) of this powerbank?

tanef (author)JanR312016-07-21

More or less 6600mAh.

egeorgiadis (author)tanef2016-07-26

6600mAh? The batteries are connected in series and you get 11.1v the capacity should be 2200mAh... Connect them in parallel and you get your 6600mA but only as 3.7v.

You can not have both worlds...

Robert Powell (author)2014-10-17

Not perfect, but cool! Great job, you could have used a step up converter instead of the step down car charger, then you could have the three 18650's in parallel and stepped power up from 3.7 to 5.0 and charged it with 5 volts. (or USB) good enough though for small devices like iPods and iPhones though. :-)

tanef (author)Robert Powell2016-07-21

I like this better, actually. I can, and have, built this with just things I have lying around the house. This way, I don't have to order a step-down converter or pull a board out of a power bank.

I did anyway, but whatever.

AnthonnyE (author)Robert Powell2015-09-21

remember the car charger input is 12 volts that's why he installed 11.1 volts batteries

Robert Powell (author)AnthonnyE2015-09-21

I know that, but I'm just saying that is another way. The way he did it is he just knew that 12.6 volts fully charged would be enough to to power the charger, and he is correct!

JanR31 (author)2015-12-03

i cant understand the diagram can anyone explain me where i put the wires?

tanef (author)JanR312016-07-21

Here. Hopefully, this ought to clarify things at least a little.

DC in can also be a solar panel.

JaidKhan0 (author)2015-12-06

Hello Calebescobar, need your help, I want to create a 10k power bank, so if possible chat me at @Natkhat_Kiddd.
Wait for your replay.

jokERron (author)2015-10-25

Great but can you have a video of your work?

ejsixthman (author)2015-09-03

hey how to know if its full charge

how to connect led to know if its fully charged

AmmadM1 (author)2015-08-25

I understood the diagram but how to recharge ??

boredguy69 (author)2015-04-10

Is it safe to charge this with just the rca directly connected to the batteries?

boredguy69 (author)2015-04-10

Is it safe to charge this with just the rca directly connected to the batteries?

shahiroom2 (author)2015-03-04

to which point in simple usb port touch the +ive & -ive wire just like in this port

shahiroom2 (author)2015-03-04

to which point in simple usb port touch the +ive & -ive wire just like in this port

shahiroom2 (author)2015-03-04

to which point in simple usb port touch the +ive & -ive wire just like in this port

shahiroom2 (author)2015-03-04

to which point in simple usb port touch the +ive & -ive wire just like in this port

junnedgar (author)2015-02-24

how to charge this thing?

iloveucharina (author)2015-02-05

may I know the specification please

ssingh163 (author)2015-01-22

Hlo sir i use 8 aa rechargable battries 4 battery hav 1000 mah so 8 batteries hav 2000 mah when i connect connect wire in car chrger my iphone 4s shw chrging but iphone battery not increase persntage it decreased after sec,min

Calebescobar11 (author)2014-09-29

I forgot to tell that it needs a charger of 11.1v or so to charge it though the rca cable

rgupta53 (author)Calebescobar112015-01-19


Pablo AndresR (author)2014-09-30

exelente idea!, te felicito

Tater Zoid (author)2014-09-29

Great job. I will build this one of these days.

BLR_RAVI (author)2014-09-29

nice..actually such chargers are very robust and handy

MsSweetSatisfaction (author)2014-09-28

This is really neat! Perfect for those times when outlets are few and far between! Thanks for sharing!

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