Maybe on a hiking trip when you want to take a beautiful photo.
Maybe when you’re trying to find your friends in a festival full of people.
It’s usually at the worst possible moment.
I recently wrote an article with a free downloadable mini-ebook on how to build a portable mobile phone charger:
In the tutorial you’ll learn how to build a portable USB charger that you can use to recharge your phone on-the-go.
It uses standard AA batteries that you can buy in any supermarket, or you can modify it to use other battery types, solar power or even power adapters not really meant for your phone.
The charger works like a 500 mA iPhone charger and will work with most modern phones.
You can download the step-by-step pdf version of the tutorial by clicking on the link in the yellow box.
Keep on Soldering!