An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert whose answer got voted for 100 times.
An expert who has posted more than 50 answers, of which 90% or more were rated as helpful.
Re: forerunner 305 battery replacement
Automotive silicon/gasket maker.
Use a tooth pick to put a VERY small amount of silicon around the entire seam. Put the two half's together and wrap tightly with electrical tape. Test the unit immediately to see if it powers on and off. If it does not open it back up and raise the small prongs that make the connection from the bottom half to the top half.
If any silicon squishes out the sides wipe with water and a rag.
Let the unit sit over night. In the morning remove the tape.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Jim Rogers had a similar problem and on his blog, he provides complete instructions on how did it. Apparently, Garmin wants $79 to do this work - but it sounds like he did it for significantly less that that.
Yes you can. Go to the Garmin Website and simply email them asking for the price of the battery and instructions on how to replace your specific model and serial number as they changed in mid year many times.
It's not always the battery, I assumed it was and opend mine up to check it out but the battery was OK. Problem was the unit wouldn't start without pressing mode + reset followed by the power button.
I lifted the internal watch contact strips to put a better connection between the two halves but that made no difference. I found that I couldn't delete all the history and the watch had recently turned itself off on a run after giving a low battery warning => the history was corrupted and caused the watch grief.
The only way I found to delete the history was to load a v 2.80 (or earlier) version of the watch s/w (current 2.90 doesn't delete history and there is no tool to do it!) Fortunately I had a copy of v2.80 but the old version is not now on the Garmin site (that I saw). Moral of the story, don't run your battery low for two reasons, Li-ion batteries lose capacity if you run them below ~30% and also if the watch "low battery" turns off while recording it can corrupt the history and really upset the watch.
At least I now know how to open the watch and have found plenty of possible small mobile phone batteries that will fit (Samsung have a few possibilities). The ABSOLUTE max size of a replacement battery is 36mm H x 43 mm wide x 5.8 mm deep. If you go 43 mm wide you have to trim a couple of internal plastic ridges in the case.
Good luck and try starting after pressing mode + reset if it won't fire up then try and delete all the history. Also DON'T run the battery low if you want it to last, Li-ion work opposite to NiCad and NiMH which should be fully discharged before recharge. You try and keep them above 50%.
You may need to re pair the unit with the heart rate monitor.
Settings/ General/ Accessories/ Heat rate monitor. RESTART SCAN.
OR follow this link (Hope it works)
Go here and click on owners manual. Go to page 46. Adding accessories.