[abracadaniel]

I've read that nearly all range reduction occurs in the first year. If you're seeing ~80% usable energy out of it, then it's probably keeping you between 10% to 90% which is probably fine. Another major factor is battery cooling. Some only air cool the batteries, and in a hot climate they will die much quicker that way. It would be nice if the details were made available as not all manufacturers will use the same limits. Even better would be if it were configurable to some degree.