Hi Rob, again, it depends on the brand of AGM. What brand is yours?
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It's not a well-known brand, but it was in my budget, here's a photo of something like I got:
https://www.aulro.com/afvb/images/im...017/08/719.jpg
Two 130 AH under pas seat same brand as your pic .Have been in going on for three and half years .One for starting 4.7 Isuzu ,13000 lb winch and all accesory charging.The other for fridge ,air compressor and camp lighting 12, volt power tools . Charging is by 120 A alternator and 100w solar panel. Works great with no problems
AM
I have had one of those for about 4.5years.
Recently had it tested for CCA and came out at 420 which is replace .
I think they started at about 850-1000CCA.
I will probably buy another one.
Regards Philip A