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I bought my Axis in Feb 2016 and replaced the engine battery in August 2019. How long depends so much on how you use it and how you take care if it. Engine batteries will not take deep discharges very many times before they are toast. So, depending on your parasitic loads, if you leave your rig not plugged in and let the battery run down below 11.8 v or so, multiple times, it will not last long. The same if you do not keep the water topped off. And if your converter/charger does not go into “float” mode and boils you batteries. There are lots of ways to “kill” batteries. Like everything else in an RV, maintenance is critical.
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