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[May 6, 2020]


My replacement internal 1/2 AA battery arrived for my GTN650 about a week ago. Things have been a little hectic lately an I just got around to replacing the battery today. To open up the GTN650, unscrew all 6 screws holding the top on.


The battery is easy to see - practically right in the middle of the unit.


I wanted to measure the voltage of the old battery to see what it was outputting. Note - the positive terminal faces the rear of the unit.


Hmmm, 3.674V out of a 3.6V battery. Seems plenty healthy to me. I might as well replace it anyways.


The new battery - SAFT LS14250.


The new battery had roughly the same output voltage as the old one.


I have a plastic screwdriver I used to unlatch the cage holding in the battery.


Simply put the screwdriver in the outer holes of the cage, and then apply a little sideways force. The cage will unlatch on the outside edges. You will need to do this on both sides.


The old battery - a Verta ER 1/2 AA 3.6C 1200 mAh battery.


Voila! New battery installed. I am not confident this will solve my issue, but it's worth a shot.





10/1/2022 Update
Richard Grinalds reached out to me asking about battery replacement of the 650xi - I assumed Garmin would use the same battery, but apparently they changed to a different type. The 650xi uses a Murata Electronics CR2450W (https://www.digikey.com/en/products/detail/murata-electronics/CR2450W/9558416) and MOLYKOTE 111 dielectric grease. Garmin charges $19 S&H, but you should be able to find these items for much less (At time of writing, battery was $2.14 on DigiKey, and the MolyKote was $7 on Amazon).


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Last Modified: October 5, 2022