Have you haver need energy for charging your mp3, cellphone, etc. when you're out of home?!
I had.. So i decide to describe how to build your portable charger.
I hope to be useful.


Step 1: What you need

Picture of What you need

- 5v regulator (i used a 7805)
- Small piece of velcro
- USB female port
- 9v battery
- 9v battery attach
- A box (i used an old burned modem)
- Hot glue (optionally)
- A solder
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GERALDB28 months ago


mukundm11 months ago

how many times we can charge our cell phone if its 2600mh

pmcguire1 year ago

is it easy to use 4 rayovac rechargeable aa batteries instead of a 9v. if so how do i make it work. and does it use the same parts. if not please tell me so i can get them. thanks

amirjee801 year ago
hi sir i do this but its work very very slow plz tell me what i do
lsavage-12 years ago
My device is showing the charging light but the status says not charging everything is hooked up correctly.
rutvik_952 years ago
will this work for samsung galaxy devices which require 5v to charge.
can i buy like that on DIY shops.?
kidharris3 years ago
I believe a 9 volt battery is just a case with 6 - 1.5 volt AAA batteries inside it. Why not just make your own case with the correct number of batteries in it?
jjone5383 years ago
Great Job
jacob 644 years ago
DO NOT TRY THIS!! haha but really don't! it was the easier of the 9 volt chargers and it just fried both my samsung rant and ipod touch 1st gen.
If it destroyed one of your devices,why did you tried again?
it works great for my mp3 :)
i even did a wall charger, and WILL DO a car charger too! :)
have fun! :o)

thank you!
this sucks it does not work
MulBe0393 years ago
there are some similar instructables on this site , but they all use resistors and/or capacitors, so why do they do this if it isn't necessary? this somehow still has to have a reason doesn't it ?
dmarax3 years ago
io l'ho fatto '' https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-ash4/s720x720/376429_280293018672192_100000744891526_949761_483419674_n.jpg '' ma 100mA non bastano per un cell, ce ne vogliono almeno 400mA oppure per il mio 550mA.... ho visto qua ma non so se funziona, non sono esperto in elettronica http://www.national.com/mpf/LM/LM78M05.html#Overview
jbaliutis3 years ago
It works 100% i made that you can charge with 4 AA baterries or 1 9v baterry
koppi4 years ago
nice! but using a voltage regulator is wasteful as it will convert excess power to heat
ssuamor4 years ago
Instead of charging up this way why wouldn't you just connect the 3 AA batteries in a series to your phone directly at the + - terminals that correspond to the + - signs on the battery and then use it immediately without burning up your battery? You'd get a lot more amp hours out of rechargeable AA batteries than your factory battery I bet, and you could probably even use your phone charger to recharge the 3 AA batteries if you leave them hooked up.
NeMewSys4 years ago
A voltage regulator? This will waste tons of energy.
ckrill14 years ago
does this work with a forth generation ipod touch?
dadoman6 years ago
I'm italian too!!! I have a question...i have to build a charger like this one but i must to charge a mp3 and it's 3.7v do i need a different regulator? if the answer is yes which one? thanks
dadoman dadoman6 years ago
i forgot... where can i find a female usb port without break my pc? thank you again
juanraz dadoman4 years ago
you can buy a usb extension cable and cut it off. http://usbextensioncable.com/
Try an electronics store for the female usb plug, and for an adjustable voltage regulator.
Dan49545 years ago
Very good instructable. I tried making this and i have everything wired exactly but when i plug in my phone, the phone turns off and wont charge. I used a volt meter and confirmed the 5VDC output. Can anyone help please? My email is dan4954@gmail.com.  Any help would be greatly appricated.
juanraz Dan49544 years ago
are you sure that the pinout is the proper one? female pinout http://pinouts.ws/usb-pinout.html
this is a very good charger.thanks for share it.
RDSawicki4 years ago
i love this but can u make a new 1 with a switch ????
Well making one with a switch is really simple you see. Take a switch. It has three prongs on it for soldering to. You only need to on either side (this side will be the on side, the other off.) now where the connecter for the 9v battery is you will use the red wire. Cut it and trim the plasticy/rubbery coating off to reveal the wire. Now connect it like this: [URL=http://img29.imageshack.us/i/helprf.png/][IMG]http://img29.imageshack.us/img29/7741/helprf.png[/IMG][/URL]
Of course you can, you just cut 1 wire in half and connect it with the correct positive and negative on it's side
lolhacker4 years ago
Hey, I was on paint and made a diagram for yall =J.:
RDSawicki4 years ago
thank u 4 posting this i tried a lot of other vidios and everything and this is the only 1 that i could get thank u and good job with the pics
ddvniek5 years ago
Hi, very nice instructable! But I have a Samsung Phone with a 3.7V Li-ion Battery. Will this work on my phone???
 if it charges by usb when it plugs in the computer then yes and don't worry about the battery info as they will be charged and regulated by the phone, in other words, its like charging it on the computer. 
Oh okay. Thanks
killshay6 years ago
Do you really need the green and white at all? or can you just snip them off?
just ignore them. they are the wires that carry data.
Scotish6 years ago
this is really awesome ill have to remember this one!
All you need from the USB cord is the Red and Black cable, as they normally are the two running the current. The other two are just for the Data running through the cable. A set up like this recharged my Game boy DS about ten times off a single 9v. I figure that the Cell Phone is more like five or six times.
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