MAhauler
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Reposted from @mach-lee's post at MacheForum 
The following are his words:
The following are his words:Finally, Ford is implementing a 12V battery health monitor that will trigger an alert in FordPass when the 12V battery needs replacement. Based on connected vehicle health data, the owner will receive a "Check 12-volt Battery" message in FordPass instructing them to visit their dealer to have their battery tested for possible replacement.
Dealership technicians will also see the alert show up when they run the vehicle's VIN and vehicle health report. If still under warranty, they will test the battery with a specific battery tester, which will determine if the battery qualifies to be replaced under warranty or not. (If the battery is past the 3yr/36k warranty period, then you would pay for replacement.)
This feature is currently enabled for 2022+ Ford Expedition and Lincoln Navigator vehicles only, but the team expects to expand this capability to other vehicles. I assume it will be coming to the Mach-E and F-150 Lightning eventually, where it is badly needed. As per usual, Ford's "soon" applies here.
As far as I can tell, the battery health monitor will use the detected battery capacity from the BMS (battery management system) to trigger the alert, not just voltage or state of charge. Generally you want to replace an AGM battery when its capacity had declined to 40-60% of new. To clear the battery health alert, the 12V battery should be replaced and the BMS must be reset, which will set the battery capacity back to "new".
Personally I'm happy to see this starting to be implemented—it's something I strongly suggested a while ago. It's helpful for ICE vehicles, but almost necessary for EVs since it's much less obvious when the 12V is going bad.
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