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
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.
<p>here is my pack lol i run my hand held cb radio from it pcb is yet to arrive the pack in middle was in 1s70p config it is now in 3s23p for a total of 50 amp hours</p>
<p>i am going to use one of these for my power pack <a href="http://www.ebay.co.uk/itm/111623325749?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT" rel="nofollow">http://www.ebay.co.uk/itm/111623325749?_trksid=p20...</a></p><p>and the imax b6 with balance lead for charging</p>
<p>you really need the 3s protection circuit to kill power if one of the cells is flat charging 3 in series is very dodgy as it is easy to over charge one and under charge another and ideal a imax b6 balance charger even a copy one would be better then nothing bonus to one of these as well is you can check capacity of the cells</p>

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