After reading expert and user reviews online, I finally decided to buy a Garmin Forerunner 245 without music! I hope to have made the right choice!? as I don't care for the advanced extras the other forerunners offers. I am just curious how much battery drainage in percentage after a 90 minute run with GPS only on? I have no intention using the heart monitor, music, and any other options, because I feel it will probably drain the Forerunner 245's battery much faster. I love to hear a response from those who do a 5 days a week. or per day during a 90 minutes run/walk interval, and how much battery drainage you have noticed! in those five days or an hour? Thank you!