Phone and Tablet Battery Charger (cheap and Rechargeable)

This is a cheap and small mobile battery to charge your cell phone and table. It easily first in your pocket. It is rechargeable and can fully charge an I phone about 5 times between recharges.

I build this using

A USB car charger
Half a used laptop battery
Hot glue
Soldering iron
Wires
Small switch
Small box

Step 1: Building It

First buy a USB car charger. They are cheap I got mine for about $6.

Use a screw driver to pop open the plastic housing.

Find a box that the 3 batteries fit in snuggly. If you have a 3D printer printing a housing would work great.

Connect the 3 batteries in series to get 12 Volts total. I also used hot glue to glue the batteries together.

Solder the wires and switch together. The switch disconnects the USB board when not in use. I also soldered wire pieces before the switch so you can charge it with the switch off.

I glued the batteries in the box. I cut holes for the switch, USB plug and charge wires. I glued a piece of cardboard on the end to close the box.

I also added hot glue on the LED which lights up the clear glue.