Posts: 3508
Location: Elk River, Minnesota | Hiya,
The mention of the AGM battery is not a specific requirement overall. Your battery will work just fine so long as it is fully charged.
Evidently people have found that with a lead-acid battery, the battery ends up being in a constant state of discharge even while running due to a verado charging system that does not supply enough juice back to the battery. This can lead to the battery not being able to supply enough voltage to the motor on start-up at a later time, and the verado electrical system will throw fault codes due to lack of juice.
From what I have been able to find (nothing solid at this point yet), the AGM battery somehow has a higher percentage of available juice at any point over a lead-acid battery, thus even on a discharge over time, a restart of the engine does not seem to throw any fault codes...
Also, an AGM battery has a slower discharge rate over time when the battery sits as compared to a lead acid battery, so codes might show up upon restart as the batteries are at different charge levels.
Thus the "requirement" of the AGM battery via the service Bulletin, which then will keep the majority of customers satisfied.
I think so long as your battery is fully charged regardless of type before you start up, you will be fine. With today's stronger electronics being used, it may even be more helpful to isolate your starting battery and run a separate battery for your electronics just to keep discharge through the day down and keep battery charge for your motor as high as possible.
Here is the link to service bulletins for mercruy. Scroll down for the AGM bulletin.
http://www.marinepartsexpress.com/mercbulletins.html
Steve
Edited by VMS 3/5/2019 12:57 PM
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