Yep, I learned my lesson on lithium charging a few years ago. Bought a couple Battleborn 100ah batteries and a PD 4645 Lithium charger for our TC. After doing the research I should have done ahead of time, I discovered the "Lithium" Progressive Dynamics charger meant that it charged at 14.6V instead of 13.6V for the "Non Lithium" charger. It never dropped from 14.6V. So the charger sits in a box in the basement, I replaced it with a WFCO 8950L2, which charges at 14.6v for 4 hours, then drops to 13.6v. Still a bit higher than I'd like, because the charged batteries sit at 13.3v when not charging, but a lot better than constant 14.6V.