Portable Battery Phone Charger





Introduction: Portable Battery Phone Charger

About: I am a 10th grade student, also learing electronics from my seniors separately. I love skateboarding and playing guitar.

Charge your phone anywhere in the world with this awesome charger
have fun

Step 1: Materials

To make this charger you need the following items
1. Your spare mobile charger or usb
2. Cardboard
3. Switch
4. A battery dock
5. An old 9v battery with less power
6. Tape
7. Scissors
8. And glue

Step 2: Wires

Cut a part of your charger or usb
and strip the ends of the wire and make sure it dont have 3 wires inside it...

Step 3: Base

Connect your battery with the dock
then take a peice of cardboard and shape it like in the picture
the poke a hole on a wall of the cardboard with the help of a compaas and insert your wire in the hole and tape the battery inside the board......

Step 4: Assembly

Connect all the wires in series and if you dont know the negetive and positive terminal so connect the in any way you want the plug the dock in your mobile
and if it is not charging just inverse the wires.
After that tape one of the wire to the base and add the switch to the other wire and then tape the whole piece and there you go...............................................

Step 5: Tips and Warnings

Now main things last

dont charge your phone for a long time
and please use a old battery othewise the battery will become very hot and can give dangerous results
and if you want to change the battery just cut the tape with a xacto knife ,change the battery and enjoyy.............



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    15 Discussions

    woooow stop, dont try this, it will destroy your phone, your phone is for 5V, you use 9V, that will destroy your pone!

    11 replies

    This is indeed the worst and most dangerous instructable I've seen.
    1. NEVER use 9v for 5v device. Use voltage regulator instead.
    2. NEVER just try connecting wires. First test positive and negative wires with multimeter before connecting wires.
    3. 9v batteries are just low capacity so not even able to charge about 50% of modern smartphones.

    i use this device almost everyday it does not harms my phone and charges it fully
    my phone works propperly and with the volt meter readings it is exact 5v and plus its my first instructable so pardon

    I will start by saying, there is a way this MIGHT work, though it would be completely on accident. If that rocker switch has a 5 volt led in it, with it's own resistor... then wired up this way, it MIGHT pass only a regulated 5 volts to the usb connector(or close enough for the phone to work with it)

    That being said, without being there to see it, I cannot say for certain, but I have serious doubts about your claims.

    Unless your phone says fisher price, the odds of being able to receive a noticeable charge, from a standard 9v battery, much less a FULL charge, is ZERO. A standard 9 volt discharged deeply enough to read 5 volt has about point oh five milliamp hours, at best, left. a rechargeable "9 volt" will reach 5 volt sooner(since it starts closer to 7 volt, fully charged) but have even LESS usable energy by the time it reads 5 volt. The main reason 9 volts are not used is because they usually top out at around 300mAh, where the smallest cell phone battery I have ever seen was over 650mAh. Even without conversion losses, that would take 2 full 9 volts tomostly charge the cell phone one time.

    We don't mean to discourage you from trying things, and posting about them. Quite the opposite. But... if you try to pull a fast one on the community, remember there are people here that design this sort of thing for a living! and many others that have tried (and occasionally succeeded) doing something very much like this.

    The instructable I think is closest to what you WANTED as a finished product is https://www.instructables.com/id/YAN9VUSBC/

    By removing the female usb port, and directly wiring your micro-usb cable to the circuit instead(double check your polarity) I think you would really be on to something. Most designs lack a switch, relying instead on the user simply disconnecting the battery when not in use. That is where i think your most noticeable improvement may lie.

    I didnt complain about the fact, that this is your first instructable, the idea is not new, but not bad. The problem is your circuit, it is extremly dangerus for your Phone!

    Some phones have voltage regulators built in, if our phone does not (99% of the time), this will ruin you cell phone battery. DO NOT Use this unless you are 100% certain you have a voltage regulator

    Even if i recomend you to stop using it, and learn more about electronics before atempting to make another instructable of this area....

    Congrats for your iniciative, and for your phone that supports this everyday :D

    I agree, you'd never should connect anything to a standard plug, which isnot matching to the standards. According to the USB specification a regulated DC voltage ranging from 5.25V to 4.75V is required, the power supply should be able to handle 500mA per port. An unregulated 9V battery clearly does not match those specifications.

    However against common knowledge 9V is usually not deadly to phones, especially not to the more expensive ones. In my galaxy S2 there is the chip FSA9280A/ FSA9288A (made by fairchild) connected directly to the USB port. This chip does not only allow to directly connect a USB stick to the phone usig an OTG adapter, or stream music out of the USB port if conneted to a docking station, but it also protects the input. According to the datasheet the chip survives -0.5 - 28V input voltage, the voltage on the data lines can be 0.5V higher than the supply voltage. I assume simliar chips are in every phone, but you should take care if yours was cheap/ entry level.

    All you (I mean everyone who commented ..uhm.. let's say "rather agressive") are not realy helpful. You know about better solutions, so why didn't you wrote about them?


    Whenever you have a great idea take a quick google search first, maybe somebody else has done that before (and in this case many people). Than think about how you can improve/ customize the design or how you can do something different but with a better approch (no, simplicity does not count, especially if it conflicts safty).

    Portable chargers have been around for a while, so here are the most typical.

    1. Simple linear regulater (7805) + 9 Volt battery: Low efficiency, low capacity, replaceble battery

    2. Step down + 9 Volt battery: High efficiency, low capacity, replaceble battery

    3. Step up/ down + several AA batteries: High efficiency, high capacity, replaceble batteries (minty boost)

    4. li-ion battery + charging circuitry + 5V step up converter + protection circuitry: High efficiency, rechargable battery(-ies)

    I linked in a few sites with valueable information, make sure to check them out. Good luck for your next project. :)

    Thats why i`m using an old battery with less power..

    that is much more worse... you should use 2 18650 cells in series with a 5V regulator and an sctive cell protection circuit... Sorry, but your way is very dumb!

    seems you don't know, but li-ion batterys (which are mostly used in cell phones) have 3,7V. also, li-ion cells need charge controllers or they could get damaged or explode. charging your phone with that... "device" is like charging your car battery with your socket outlet cause "hey, it's just electricity too". Seriously, don't build or use it.


    4 years ago

    Not so good but its usefull in our daily life plus he is a beginner like me

    wowww its so good i might try this