I made my own portable phone charger, and I didn't electrocute myself - The Verge
DIY 9V Battery USB Charger
9V Battery Backup Circuit using LM7809
Energizer Universal AA, AAA, C, D & 9 Volt Smart Battery Charger
Mobile Charger with a 9V Battery | Prototype Circuit
A Simple hack to Charge Your Phone With a 9-Volt Battery | Iphone hacks, 9 volt battery, Phone charging
How to Make a Mobile Charger : 3 Steps (with Pictures) - Instructables
Amazon.com: AA and 9 volt battery charger with 3, 6, 9, and 12 volt power supply : Automotive
Automatic Battery Charger for 12v 9v 6v Batteries
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Mobile Charger with a 9V Battery | Prototype Circuit
How to Charge Your Phone With a 9 Volt Battery
How to Charge Your Phone Using a 9 | Volt Battery | Gadget Salvation Blog
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You can charge a phone with a 9 volt battery - 6 things you may not know about charging your phone | The Economic Times