700mAh 361-00026-00 Battery Garmin Forerunner 205, Forerunner 305
Having had my Garmin 205 for several years the old battery was not retaining a charge.  I replaced the battery and it has worked well.  I would not recommend the replacement to someone with no experience in this type of work.  The hardest part was getting the cover apart on the Garmin 205.  After completing the replacement there were some scratches on the case caused by prying it apart. Nothing serious and not affecting the performance of the watch.