Originally Posted by Okrver
My interstate batteries where replaced after 11 years with no issues. Just replaced because of age.
If these were Lead Acid you must have had a special blessing along the way. My experience with batteries is 3-4 years. Professionally speaking licensed fire alarm engineer, batteries for these devices MUST be replaced after 5 years of service. Few if any of these sealed batteries last that long. On the MH I have two very large marine AGM batteries for starting and two deep cycle golf cart 6 volt batteries in series for the house. we will be adding two more for the house soon as two only last a few days with the furnace running.
on our boat, we replace the typical marine deep cycle battery every three years. They usually go bad during the fourth year and we don't need to be out there with dead or weak batteries.
On the RV house we get about 2-3 seasons but the get used hard. the starting batteries are very powerful and expect them to last the 10 years. I use these AGM because they start a cold diesel very fast. Always keep you starting batteries strong as you do not want to drag your starter motor long than necessary as it will reduce the life of the device.
Good batteries last longer because the have thicker plates and more reserve. All batteries last longer if properly charge and never deeply discharged. more batteries help to minimize deep cycling. Over charging will always overheat a battery and shorten the life. Sealed batteries offer the easiest options with minimal maintenance. There are recovery caps that can be used on wet cell which will minimize the amount of recharge water required.
There is a lot to talk about when it comes to batteries and a lot has been already posted. Of course, everyone will have an opinion - some right some wrong.