I know this probably ought to be in the electronics area, but some of us never go there and this may help someone.
My 2 y/o Garmin 305 is not holding a charge very well. I charged it after my Thursday AM ride, and Sat AM the darn thing died 15 min into my ride. And wouldn't you know, I was on a strange ride I had never done before.
Anyway, I googled "Garmin 305 battery replacement" and I found this site:http://www.jimcarson.com/2009/replac...rmin-edge-305/
Since I was a electronics tech for much of my life, this is a no brainer. And I found the bigger battery on ebay for $2.96 and FREE SHIPPING! So, next week I'll be able to put this in, and enjoy long rides.
Hope this might help some others.