I made my own portable phone charger, and I didn't electrocute myself - The Verge
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$3 Solar Powered 9 Volt Battery Charger – Perfect First Time Project! : 10 Steps (with Pictures) - Instructables
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How to Make Auto Cut Off Battery Charger For 12V/9V/6V (Easy-Way) - YouTube
Super Easy 9V Emergency USB Charger : 8 Steps (with Pictures) - Instructables
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How to Make Mobile Charger With AA, 9V Battery (Regulated Voltage)
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First 9v Battery that can be Recharged from a USB Port - Hackster.io
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Energizer Recharge Universal 9-Volt Battery (1-Pack), Rechargeable 9V Battery NH22NBP - The Home Depot
How to make a DIY Power Bank with 9 Volt Battery
Automatic Battery Charger for 12v 9v 6v Batteries
