GPS Repair Problems? Ask a GPS Technician for Answers ASAP
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The battery can be replaced at home. Do you know how to use a soldering iron or know a friend that knows how to use one?
You can purchase the replacement from Amazon. Here is the link: http://www.amazon.com/700mAh-361-00026-00-Battery-Garmin-Forerunner/dp/B00AOLFDR0
Garmin no longer provides support for the Forerunner 305.
I can type out the instructions, but i will give you a link to a video which contains detailed instructions on carefully opening the device, replacing the battery and how to close your device.
That is the link to the video on replacing the battery.
I hope this information was helpful, if you have any other questions, please let me know. If not, have a great night and good luck on your Susan G. Komen 3 Day event. Also please take a moment to rate my service. Additionally, if you have questions while your doing the job, please come back and ask and I will gladly clarify anything you need clarified.