Battery Powered USB Charger

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About: I have always enjoyed taking things apart and putting them back together as a child, and learning how they work. As I got older I began to fix electronics and when I was 13 I bought my first soldering iron. ...

In this instructable I will be making a tutorial on building your own portable battery powered charger to charge all your USB devices!

Step 1: Obtain Parts

-9v battery clip (two is better but one works fine)+ batteries (rechargeable are more efficient)
-Female USB port (salvaged mine from a USB hub
-7805 regulator (or any other regulator that outputs 5v@1-2 amps.
-Altoids tin (or any other housing)
-Optional switch

Step 2: Identify Pins

You need to identify the pins for the positive and negative on the USB and also the input/output of the regulator.

Step 3: Begin Soldering/Assembly

-If you are using one battery skip this step: solder the positive of one clip to the positive of the other battery clip and do the same to the negative (series)
-Solder the negative coming from power to the first pin of your regulator
-Solder the negative from the USB and the negative from the power to the middle pin of the regulator
-Solder the positive from the USB to the third pin of your regulator

Step 4: Schematic

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    16 Discussions

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    krruiz

    4 years ago on Introduction

    I can get it to charge another USB device but not an iPhone 4 or 5. What did I do wrong?

    3 replies
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    Typicalinventer719krruiz

    Reply 3 years ago

    because you need to use two 100 ohm resisters connecting between the D-, D+, and 5+ volt terminals

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    xaenonkrruiz

    Reply 4 years ago on Introduction

    iDevices are unique in their charging ports. They need a voltage on one of the data pins, in addition to the typical 5V USB current, to charge correctly. I don't have all the details but I'm sure you can google for this information.

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    sammydogjjkrruiz

    Reply 4 years ago

    Make sure the batteries are putting out at least 5v overall, and make sure the charging cable works. If you need anymore help, feel free to comment again ^.^

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    xaenonchetan pujar

    Reply 4 years ago on Introduction

    Some newer Android devices (and iWhatever gadgets, too) need higher charging current. I know my Transpyre won't charge with the USB adapter from my little brick phone, even though both are 5V USB chargers.

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    isssam

    4 years ago on Introduction

    is there any other steps. im using the free account

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    jcagle2

    5 years ago

    When storing multiple 9v batteries together always electrical tape the ends. Just a safety tip to prevent possible fires.

    3 replies
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    sammydogjjjcagle2

    Reply 5 years ago on Introduction

    I just stuck them in the box to show how it all fits. I would never store them bare. I store them by removing the wire off a 9v battery clip and subsequently attaching the batteries to the clip.

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    sammydogjjuzziah0

    Reply 5 years ago on Introduction

    AAs would hold their charge longer, but are more expensive and bulkier than a single or a pair of 9v batteries.

    you would get a better result if the batteries were in parallel instead of series. Parallel would incerease the amp output which is what you would want for more charging

    2 replies

    I literally logged in to change my mistake, and I got a notification from this comment. Thanks for the tip! You are one of my favorite instructables user!

    No problem! Just trying to help out when I can. And thank you! Your kind words are very nice to hear :) made my day