Introduction: Charge Your Phone With a Car Battery (6V-24V)

About: Awesome Electronics Tutorials, Projects and How To´s

Charging your smartphone while camping outside is not always easy. I am showing you how to charge your phone by using a car battery and a moped battery. You can also use the gadget with any kind of 6V-24V power source.

Step 1: Watch the Video!

The video already talks about the most important facts. But I will also give you some more informations about the project in the next steps.

Step 2: It Is Time to Choose Your Circuit!

You may have noticed that I build 2 cicuits inside this gadget, which basically have the same function. But they have their own pros and cons:


+ very simple, perfect for beginners

+ very cheap

+ useful when you only need a little current

- efficiency is horrible with higher voltages (24V --> 21%--> becomes a heater)

(12V --> 42%--> not nice)


- more complex circuit

- more parts, more costs

+ efficiency is quite good for a DIY phone charger (around 80%)

You can decide which one you want to use or maybe you build both. It is up to you.

Step 3: The Simple Way: LM7805!

Get your parts here (affiliate links):



Capacitor Kit:


Capacitor Kit:

You only need 3 parts for this circuit. If you got all the parts then follow the schematic to create your circuit. Feel free to store your new gadget in an awesome case.

Step 4: The Efficient Way: LM2576!

Get your parts here (affiliate links):

LM 2576 (be sure to get the 5V version, there also exists an adjustable one):

Capacitor kit:

Schottky Diode:


This circuit requires 5 parts. But it is still pretty cheap and creating the circuit should be fairly easy.

Step 5: Combine the Circuits and Make a Case!

If you decided to build both circuits and you want to combine them in one awesome case like me, then get your parts and follow the schematic.


Rotary switch:

Binding post:

Green LED 5mm:

DC switch:

Step 6: Success!

I hope your new gadgets works great and you enjoyed this project.

Feel free to check out my Youtube channel for more awesome projects.

You can also follow me on Facebook, Twitter and Google+ for news about upcoming projects and behind the scenes informations.