Have you ever experienced that your phone’s battery dies when you need it the most?
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.
In this 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.
Note: This was created back in 2016 when batteries where much smaller than today. These days, most phones require a more powerful charger. But you can use it for anything that can be powered from USB and only requires 500 mA.
Click the button below to download the tutorial How To Build A Portable USB Charger.