Search Amazon, ive picked up batteries for my original Motorola Droid for 5$ each. I also have a dock i got for 15$ that has a spot in it for a battery, so i can charge my batteries outside of my phone. On top of that i get 7 hours of GPS & Music use on my phone so power is never an issue for me when doing multi day and distance and i can use my phone to the fullest without concern.