I'm taking the leap and going to lithium ion. These batteries are only 3 years old and have lots of life left in them. I have a load tester and can load test them before you buy so you know they are still good. They are the AGM sealed batteries. No water to check and no corrosion on the terminals. If you would like the battery boxes also, I have installed a disconnect and voltmeter on one of the box covers and a 12 volt connector for exterior charging. If you want them, they go with