Introduction: Battery Powered USB Charger

Picture of Battery Powered USB Charger

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

Picture of 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

Picture of 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

Picture of 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

Picture of Schematic


krruiz (author)2014-11-03

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

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

xaenon (author)krruiz2015-05-09

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.

sammydogjj (author)krruiz2014-11-11

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 ^.^

chetan pujar (author)2014-11-13

why 1 to 2 amps? i feel it would be too much for a phone charging. tell me if i m wrong

xaenon (author)chetan pujar2015-05-09

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.

isssam (author)2015-01-16

is there any other steps. im using the free account

jcagle2 (author)2014-01-20

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

sammydogjj (author)jcagle22014-01-20

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.

glora (author)sammydogjj2014-09-02


sammydogjj (author)glora2014-09-03
uzziah0 (author)2014-04-03

Is using a 9V battery better than some AAs?

sammydogjj (author)uzziah02014-04-10

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

out-of-the-box (author)2014-01-21

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

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

About This Instructable




Bio: 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 ... More »
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