If you got a Android or Iphone, and like all smartphones; the battery won't last more than eight hours.

When you go on long trips, I like to be prepared. I also like to listen to music, user web , video or game you need

external Power Bank Backup Battery You can buy but you can homemade it very cheap and very easy

In here I homemade Boosting 3V to 5V board with MC34063 ( You see it on google with Boosting MC34063 or buy it on EBay under $5

More Homemade External Power Bank Backup Battery for Smart Phone here:

Good Luck

<p>they called this site instructables but you need to sign up and pay them for the schematics.. where is the diagram?</p>
<p>Please provide the schematics of the circuits Please.</p>