This is a very easy and inexpensive way to make a backup charger for your cell phone or hotspot. It fits in your briefcase or even your pocket. 

It also includes some very useful information about AA battery types and their relative power.

If you are a tinkerer, you're probably capable of following the instructions successfully. If you don't understand the table of comparisons of the batteries, then you probably shouldn't try the project. Good Luck!



Adapters Charge Cell Phones Using Standard AA Batteries | Power content from Electronic Design