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This is a portable usb charger made for a car charger and an Altoids tin .

Step 1: Parts

You will need an Altoids tin, USB car charger, 9 volt battery and clip ,and a small toggle switch

Step 2: Soldering

Solder the negative wire of the battery clip to the negative terminal of the car charger. Solder the positive wire to one side of the toggle switch then solder a wire to the other switch terminal and the other end of the wire to the positive terminal of the car charger

Step 3: Drilling

Drill a hole for the switch and the usb

Step 4: Assembling

Put the parts in the Altoids tin
<p>I tried it but it doesn't work </p>
instead of using the car adapter you can unsolder the USB with a little but of work and use an L7805 (5V regulator) and make it so you can use any power source between 7-24 volts to get the perfect 5v a phone needs. great work tho very simple
Thx
<p>you can see my instructables here: https://www.instructables.com/id/PowerBank-2Usb-2200mAh-26watt/</p>
<p>electronics circuit dont permit you to use all power inside battery(the usb adapter</p><p>work between 12/24 volt) under 12volt.Use two battery(serial connect) to have 18volt and a best result and all power available inside battery...... :) </p>
I like it!
<p>Super simple! </p>

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