[Q] Portable Charger

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http://forum.xda-developers.com – hello, i want to make a portable charger from 3 AAA batteries (1.5v and 2500mah). i know i need to conect it in serial to obtain 4.5v and 2500 mah. i just want to know if it can damage my phone. any reviews please? Sent from my GT-I9100 using xda app-developers app (HowTos)