Originally Posted by
magohn
Thats a fine setup for shorter rides but if you are riding 4+ hours - the constant GPS pinging will flatten the phones battery. Then when you reach for your trusty phone to call for SAG backup your between a rock and a hard place - ask me how I know
My 705 will go 12 hours on a charge. Best gadget I own and if it broke tomorrow I would buy another in a heartbeat...
Yeah, I'm thinking about buying a backup and/or extended life battery for my phone -- still way cheaper than an Edge.

My phone lasted for nearly 6 hours with the GPS on the entire time the other day, and still had about 25% power left.