Question about Garmin Forerunner 305 GPS Receiver

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Battery Replacement Garmin Forerunner 305

Hi I understand you got advice on how to change the battery/ open the casing on your 305 please could you let me know I'm having probs with water ingress

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they are fixed in you have to take the hole thing to bits

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Forrunner305 battery replacement


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.

Check Jim's blog (by clicking) below:

http://www.jimandkatrin.com/CodeBlog/post/Forerunner-305-Battery-Replacement.aspx

If it looks too involved for you, check Garmin's "Out of Warranty page, below:

http://www8.garmin.com/support/outofwarranty.html

I hope this helps & good luck!

Nov 16, 2011 | Garmin Forerunner 305 GPS Receiver

1 Answer

Garmin 305 will not power on. When connected to charger screen says "battery charging complete" but will not power on. Advice?


two things... go to www.garmin.com and see if your gps qualifies for the battery recall. and second try powering it on when the power cord is hooked up rather then just on battery. then try it without the power cord

May 14, 2011 | Garmin Forerunner 305 GPS Receiver

1 Answer

Forerunner 305 GPS Receiver: Is it possible to change the battery in a Garmin F...


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.

May 03, 2010 | GPS

3 Answers

Garmin Forerunner 305 won't turn on and won't charge. Is there a fix or is this it for the device?


Look at
"http://www.activesplit.com/my-garmin-forerunner-305-doesnt-power-on-its-just-dead-solutions/"

You can soft reset or hard reset the device. Hard reset deletes all data.

Apr 01, 2010 | Garmin Forerunner 305 GPS Receiver

2 Answers

Garmin Forerunner battery replacement


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%.

Steve

Sep 20, 2008 | Garmin Forerunner 305 GPS Receiver

1 Answer

Replacing battery on Forerunner 305


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

regards,
Ralf

Aug 11, 2008 | Garmin Forerunner 305 GPS Receiver

3 Answers

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.

Jul 14, 2008 | Garmin Forerunner 305 GPS Receiver

2 Answers

Battery doesen't keep the charge. I can't open the case to change battery forerunner 305


Hi Samdot,

I have just been through a similar problem through ingress of water into the device (They are not in the slightest bit water proof)

My device would power on, but only in the cradle attached to the usb and it would say the battery was fully charged after 4 seconds.

Any way, the battery can be replaced using the following method.
Take a decent, thin penknife and gently lever the top off the Garmin (follow the crease above the buttons). There are no catches to be aware of it is just lightly glued.

Once the lid is off you will be able to remove the two circuit boards (they just sit in there) and you will see the battery in the bottom of the case.

Unscrew the two small screw above the battery connections and you will be able to replace the li-ion battery which is in place.

I can provide images if that would be useful.
Phil

Jun 17, 2008 | Garmin Forerunner 305 GPS Receiver

2 Answers

Garmin Forerunner 305


Make sure the small prong under the battery is bent out a bit, sounds like an intermittened connection problem.

Mar 17, 2008 | Garmin Forerunner 305 GPS Receiver

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