H8 Battery in 2023 GMC Yukon

[Bruin19]

I just installed it and it fits.  Its best to have a dealership do it as there is a specific battery disconnection procedure to follow.  If not followed you will need a new telematics module.  There are electrical connectors which are tricky to disconnect.  If you know the tricks its easy.  

 

To fit the H8 into the tray you have to remove the spacer and its one bolt to remove.

 

My telematics module is already broken and a mechanic showed me the tricks to disconnect the electrical connectors.  There were 4 specific connectors.  2 were red tab connectors  Pull back red tab than press down on center black square than pull.  Comes out easy if done right.  2 connectors on top of battery taken out easily with emergency key trick.  It wasnt easy until I was shown.  Dont force.  Easy to break.

 

 

[Bruin19]

[sierra015]

Were you having issues with the OEM size battery or just wanting to upgrade?

[newdude]

Yea, why the size change?  You didn't seem to gain a whole much more with the larger one, and there are 94 AGM (H7) batteries on the market with similar specs to the one you got.  

 

Free Shipping! EverStart AGM Automotive Battery, Group Size H7, 12V, 850 CCA, 140 Minutes Reserve Capacity - Walmart.com

Edited October 7, 2025 by newdude

[fondupot]

Dropping this video here for future viewers of this thread, save yourself the trouble at the dealership or auto mechanic. Do it yourself, it can be done with basic hand tools.