The battery I received from iFixit doesn’t work with my Garmin Fenix 3 HR watch. Once installed the watch does not turn on. Plugging it in to charger give me Garmin logo and then 100% Battery indicator. However when I remove from Charger, watch shuts off again. iFixit sent me two different batteries, but they are the same model number (CS-GMF300SH). Again, these batteries don’t work with my Garmin Fenix 3 HR. My original Garmin battery still works in watch, it’s just no longer staying charged much longer than about 4-5 days, hence my attempt to replace.

The battery I received from iFixit doesn’t work. When I tried it, the watch does not turn on. When I put watch in the charger it comes on and says "Battery 100%” but as soon is it’s unplugged from the charger it turns off again and is unresponsive. I put the old garmin battery back in and it works again. Will be returning replacement battery to ifixit.

Mine does the exact same thing. It no longer turns on. It says battery 100% on charger but as soon as I remove it from charger it turns off again and won’t turn on.