Garmin Edge 800 Battery Replacement I just replaced the battery and back case on my Garmin Edge 800 bike GPS, it was pretty easy and as long as you have the right tools you shouldn't have any trouble. Just make sure you have good lighting, and make sure the small screws don't roll away. You should also make sure you're not causing any static discharge - ground yourself if you're in a carpeted or dry environment. You'll need a Torx T5 screwdriver and a plastic spudger (or just a plastic knife from any take-out meals you've had recently) BE GENTLE with the screws, fingertip tight is plenty. They will strip easily if over-torqued. Here's my Garmin Edge 800 and a new white back case with battery that I got off eBay Remove the 6 Torx T5 screws around the edge of the Garmin Now the front case and touch screen will come off. DO NOT PULL IT OFF YET - the touch screen is attached to the board below with a very short ribbon cable. Use your spudger or plastic knife and pop off the connector from the board below, then remove the front case & screen Continued below.... https://staminist.com/read.php?1,298,298#msg-298 Fri, 08 May 2026 08:05:50 -0500 Phorum 5.2.19 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298#
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Skye
Good point, there is a good chance the PCB is a different size, although it might just be a different offset. It's a lot of work removing all that caulking so I'm not going to check any time soon. I just checked my spare case and it's also a 10mm or I would have offered to sell it to you for cheap ;)
Skye

Hi Skye,
You still have the spare case and looking to sell for cheap? I just busted the ears of my mount and measured (thanks to this thread) that I have a 10mm case. I'm not picky for colours - just one with ears please!
Thanks. ^ CLICK TO REPLY]]> rockford72 Cycling Forum Sun, 06 Nov 2016 21:28:15 -0600 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# In addition, you'll notice the stamp "N20233" is below the check mark icon on the 10mm "three dot" case, while it's to the right of the check mark on the 8mm "one dot" case.
Great info, very easy to tell which is which from a quick look at the ports now.
Skye ^ CLICK TO REPLY]]> Skye Cycling Forum Wed, 28 Sep 2016 14:38:48 -0500 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# Below the picture with some easy clues that seem to make the difference: ^ CLICK TO REPLY]]> RJC88 Cycling Forum Mon, 26 Sep 2016 08:30:03 -0500 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# So thanks for this information ^ CLICK TO REPLY]]> Ant Cycling Forum Sat, 24 Sep 2016 06:20:43 -0500 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# Also, You can tell which version you you have without opening it by externally measuring the area below the usb port. The 8mm (one dot) version measures about 9mm from bottom center of usb port to the edge of the black, and the 10mm version measures approx 7mm. See attached photo. ^ CLICK TO REPLY]]> akcyclist Cycling Forum Sat, 24 Sep 2016 02:24:25 -0500 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# garmin fixing attachment http://www.racewaredirect.co/shop/garmin-tab-repair/
you may see that it a whole unit that simply fixes on the existing one after you have removed whats left of the old dog ears fixing just epoxy resin it on I did it and can recommend it ^ CLICK TO REPLY]]> Ant Cycling Forum Fri, 09 Sep 2016 04:14:01 -0500 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# I have not found any relation between serial no. and type of case.
I found out that removing the USB/SD board was easy. Just remove the sealant and pop it out with a needle. Replacing it wouldn't be such a hard thing to do. I never had to place it back and make the case water resistant again, so that is still a thing to figure out. ^ CLICK TO REPLY]]> RJC88 Cycling Forum Thu, 08 Sep 2016 10:37:29 -0500 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# Ant Cycling Forum Fri, 12 Aug 2016 12:08:24 -0500 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# Skye ^ CLICK TO REPLY]]> Skye Cycling Forum Thu, 11 Aug 2016 16:25:32 -0500 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# Ant Cycling Forum Fri, 05 Aug 2016 12:20:12 -0500 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# Ant Cycling Forum Fri, 05 Aug 2016 10:17:10 -0500 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# Just curious, how did the quarter-turn mount tabs break off? Crash your bike?
Skye
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Ant
So As I need to replace my edge 800 case (the tabs cracked and one broke off) is there any way for looking at the unit from the outside to the the difference? I presume not? Mine is a black/white case and a 2013 model as I have managed to get a case off eBay a white one I remember when these 800's were released so don't know if mines an older model so would that be the 8mm or 10mm many thanks for your advice
^ CLICK TO REPLY]]> Skye Cycling Forum Thu, 04 Aug 2016 17:22:55 -0500 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# Ant Cycling Forum Thu, 04 Aug 2016 04:11:53 -0500 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# Skye Cycling Forum Mon, 01 Feb 2016 15:37:23 -0600 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# Also the case seems to be the same (on the outside) for Edge 800/810 and Touring (plus). The Edge 810 has the 10mm case. The 800 has two sizes.
I will have to change a USB/SD board to another case, because it doesn't fit. The other case has a non working SD card reader. I hope I can get it water resistant again after that. I will report back on that, if you like. ^ CLICK TO REPLY]]> RJC88 Cycling Forum Mon, 01 Feb 2016 10:17:38 -0600 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# Skye Cycling Forum Sat, 30 Jan 2016 03:21:53 -0600 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# My Garmin has a version 2 main PCB and is in a 8mm version and I have had a version 3 PCB, which needed the 10mm case. That might help figuring things out.
On the pictures I have shown you where to look for the marks. It's not solid that it works like this, but it's a start. the distance from that bit of the case should be 8 or 10mm from top to the inner side of the case below (along the line on the black/white case on the picture). ^ CLICK TO REPLY]]> RJC88 Cycling Forum Wed, 27 Jan 2016 04:59:41 -0600 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# Could you point out the 3 circles vs 1 circle with square area on the photo below? Not quite clear on where I should be looking.
I attached a zoomed crop of one of the photos above, since the white & blue back cases/battery PCBs don't seem to be compatible, the markings should be different.
The only obvious difference I can see, is that one PCB is labelled 94V-0_331-2 and the other just 94V-0. Some of the other numbers look different too (top right) but are covered by the black caulking on that model. Maybe the clear vs black glue is a sign as well...
Thanks,
Skye ^ CLICK TO REPLY]]> Skye Cycling Forum Tue, 26 Jan 2016 16:27:46 -0600 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# There seems to be a visible difference. The '8mm' has 3 circles (left to right) on that part and the '10mm' seems to have just one and a square above. ^ CLICK TO REPLY]]> RJC88 Cycling Forum Tue, 26 Jan 2016 15:26:31 -0600 https://staminist.com/read.php?1,298# Re: Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298#
You can now shift the screen slightly to expose the post holes that the screen case sits in. Put your screwdriver in one of these empty holes (not a hole that a screw was in) and that should give you just enough leverage to pop the PCB board off the back case connector

Done! Now you have access to the battery, you can replace it or replace the entire back case.
PLEASE NOTE that if you're planning to replace the entire back case, the new battery/connectors board may not line up with your existing main board. I think this is because the two boards were connected and then glued into the back case at the factory, for resistance to moisture. If it doesn't line up, you'll have to cut away all the glue with an Xacto knife, a very tedious process.
If you're just replacing the battery though, there's no change in the way things line up so you can ignore that warning.

Assembly is, as they say, the reverse of disassembly. When reconnecting the main board to the back case board, it's helpful to flip the screen forward and press down on the area covered by the barcode. Very little force should be required for the connector to pop into place.
^ CLICK TO REPLY]]> Skye Cycling Forum Sun, 08 Nov 2015 14:52:11 -0600 https://staminist.com/read.php?1,298# Garmin Edge 800 Battery Replacement https://staminist.com/read.php?1,298# You'll need a Torx T5 screwdriver and a plastic spudger (or just a plastic knife from any take-out meals you've had recently)
BE GENTLE with the screws, fingertip tight is plenty. They will strip easily if over-torqued.
Here's my Garmin Edge 800 and a new white back case with battery that I got off eBay

Remove the 6 Torx T5 screws around the edge of the Garmin

Now the front case and touch screen will come off. DO NOT PULL IT OFF YET - the touch screen is attached to the board below with a very short ribbon cable. Use your spudger or plastic knife and pop off the connector from the board below, then remove the front case & screen


Continued below.... ^ CLICK TO REPLY]]> Skye Cycling Forum Sun, 08 Nov 2015 14:44:31 -0600