I have a Garmin 705 but he must admit that I always a little. with that thing on a war footing was, but there is simply no other company that manufactures a similar sound operational unit So, after 2 years, the battery was broken. I was amazed how easy it can be to change the battery, namely open by 6 screws, pull slightly einkeklebten battery carefully, plug pull out, put any old tape on the new battery, plug in this, insert red seal of the housing again tidy and the device screws with the 6 turn. After 15 minutes working the old Garmin like new. This process is supposed to Garmin 100 - 120 Costs I'm told, so I have at least 100 saves. The new battery will last through at least 12 hours, which I have already tested to Hauese.