Question about Garmin Forerunner 305 GPS Receiver
Might not be the battery.My wife's was always powering off during runs. Then it would not power on at all. There was a connection inside that wasn't making contact. But first First try cleaning the 4 brass connection tabs on the watch and check your charger to make sure the tabs are raised and not squished. Second try to reset the unit. Hit mode reset and power buttons all at the same time. Hold these for 3 seconds and then release. If these do not work here is what I did. There are no screws holding the unit together. I used a exacto blade to very carefully pry the unit apart along the side seam. It's not easy to do. Be very cautious and gentle. Work the thickness of the blade into the joint to gently wedge apart. You are not trying to remove material! Once apart you will see some brass fingers that make a connection between the upper and lower part of the unit. This is where the problem was with my wife's 305. I gently raised these tabs to make a better connection, It's been working ever since. I didn't try it before but try pressing very hard on the unit where it says Forerunner 305. The case is very hard so it might not work. But if it powers up when pushing you found your problem. Hope this helps.Here is a link I found on opening a 205 (Same process) http://ctorunner.googlepages.com/dismantleforerunner205 To put the unit back together use 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 more 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.
Posted on Jun 09, 2009
Well it is an accumulator instead of a battery so just recharge it.
If the accumulatoris gone I think you have to use the garmin support
Posted on Aug 21, 2008
I used the battery from a sumsung hue cell phone.
Posted on Aug 15, 2009
I found this on the internet......
In the battery compartment there’s a gold contact that touches the top of the battery (+ve) which was in a position that would never make contact with the battery. I bent it out slightly, made sure the battery was seated correctly (i.e. flat) and as if by magic my heart rate appeared on the large Garmin display!
Also found this..........
I Have had the same problem couple of times (and forgotten each time how I solved it). I figured it out just now and this is what I did.
1) turn on unit and put on heart monitor (make sure battery is good and wet heart strap)
2) using the mode button navigate the menus to: Settings: General: Accessories: Heart Rate Monitor
3) Once in the Heart Rate Monitor option make sure "Yes" is selected and then use the arrow buttons to highlight "Restart Scan" . Press the enter button to rescan for your heart monitor. (I had to rescan twice)
Go back to the main monitor screen to see if you are recieving heart rate signals.
I am not sure why a manual rescan needs to be done every time but it would be nice if Garmin fixed this issues in a unit software update (my unit has software version 2.80
Posted on Nov 13, 2009
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Posted on Jan 02, 2017
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