I have a question about charge controllers for lithium batteries. My understanding is that lithium batteries like to be stored with about a 75% charge. In order to maximize the life of the battery, it seems like it would be useful to have an easily accessible setting on the controller for the charge percentage at which it should maintain the battery at. For example, during the majority of the time that I'm not using the camper, I'd set it to maintain at 75%. Then on the day before or the day of heading out for a trip, I'd change it to 100%. Is this easy to do, and how much of a difference is it likely to make in terms of battery life?
For context, I'm considering purchasing a 2017 Fleet this week with dual 12V AGM batteries that will probably be due for replacement soon. Definitely want to upgrade to lithium when that happens.