Been 8 years since I set my solar controller. Have not even looked at the settings since. Why would I want that on my phone?
14.4, 13.6, 13.2 is fine for the converter. Yes If I went lithium I might want something else. Although I have my doubts. BT program on my phone should not be needed. I would deal with it if BT/phone was necessary but would not seek it out.
I expect to use same battery format for 6 to 8 more years. Will see what is needed if I move to a MH after that time. Remember I don't even have a real battery monitor. ;) Never seemed to need it.