You may have so many old mobile phone chargers, which are not usable now. This DIY tutorial will show you how you can give a second life to your old mobile phone chargers to charge any of your devices supporting USB charging.
What you will do on this is
Remove the connector
Make sure the output is 5V (volt)
Add a USB socket to it
Use it
Things you will need to have
Soldering iron and tin
Multimeter (to find + and –)
Your old charger
USB socket
Some glue
Some heat shrink (optional)
You can read more here with step by step instructions with photos.