Universal Battery Charger

As part of my preperations for WWDC I decided to get an external battery charger for my iPhone.  I never actually ran out of power last year, but I got very close almost every day and I had to make an effort to keep it charged.  I think it will be nice to have a charger available for emergencies.  I looked on monoprice for their 30-pin compatible chargers and I found a few of them.  But there are a lot of problems with these.  For one thing, they're marked up on price compared to the USB options.  For another, if you use a case you'll have to take it off to use them.  I didn't want to deal with either of those issues, so I decided to combine parts to make my own.

Here's what I got:

That is a 2800 mAh battery, a USB 2.0 A Male to mini 5 pin Female adapter, and a USB 2.0 A Female to A Female coupler.  What that let's you do is plug any Apple 30-pin cable into the battery to charge your devices.

I tested it out on my iPhone and it worked very well.  It charged my phone from 50% to 100% in 1.5 hours and used about 3/4 of the battery's charge.  I'll definitely be keeping this guy charged up and in my backpack all week long at dub dub.

Screenshot of shopping cart below: