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This instructable will show you how to make  usb pen- charger, from metal pen, and a usb car charger...

Step 1: You Will Need...

Yuo will need >

Step 2: Open...

Open your usb car charger...

Step 3: Solder...

Solder anode and cathode to wires...

Step 4: Add Switch

Add switch to the circuit, and test it!
<p>I realize that this is old but there isnt much description. What is this? just a usb charrger stuck on pen tube? I dont get it and the video isnt working </p>
I assume your powering the charger from the coin cells but can't tell from blurry pictures or text.
Yes, it is a small button cell`s:

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