My story starts with a van that I thought worked pretty well. I was then very disappointed that I needed to replace 2 AGM batteries after about 2 1/2 years. I then had to replace the batteries again after another 2 years. Considering the AGM in the car is over 5 years old and cycles every day the caravan seemed pretty bad. I just finished putting in an upgrade to a J35D and 300amp Lithium. When I replaced the J35c I heard rattling from inside. Photos below