Keyring Phone Charger

In this Instructable, I made a simple keyring charger.

It can charge your phone's battery with a standard 9v battery.

If you ever travel and find that your battery is dying, just get a 9v battery and use your keyring to charge your phone.

For this project you'll need:

• Car's USB charger
• Micro USB to USB adapter
• 2x 9v batteries or battery connectors
• Sugru

Step 1:

I removed the connector from a 9 v battery.

Then, I soldered cables to it.

Alternatively you can buy a battery connector.

Step 2:

I took apart car's USB charger and soldered battery connectors to it.

Step 3:

I could have used USB adapter without opening it, but I wanted to make it smaller, so I did open it.

Step 4:

I removed the LED from the charger.

Then, I covered everything with Sugru.

I also made a pattern with a screwdriver.

Once I was happy with the result, I half-plugged the charger in the phone and let it dry.

Step 5:

I also made a protective cap for the connector.

Finally, I attached another connector from a 9V battery to my keys.

Now the charger can be easily attached to the keys.

If you need to give your phone a boost, take off the keyring and use a 9V battery to charger your phone.

Charging speed and efficiency will depend on your phone, cars USB charger and the battery you will use.

Smaller phones with a high capacity 9V battery will charge better than big phones.