Hello, I am wondering if I can make a phone charger that has an output of 5.2V 1A and as efficient as possible running on batteries. I have 7805 voltage regulators and lm317's but when I use the 7805 with a 9v battery, it does not supply enough current to make my phone battery percentage go up...it just remains constant (I believe 300mA or so if I remember correctly). How can I go about making this? Any ideas? Thank you in advance