I have a couple of Luna adjustable mini-chargers (52v) that you set for 80/90/100% charge on a rotary switch and forget about it. It turns off at the appropriate voltage but doesn't balance unless the 100% is chosen. I went looking for another adjustable charger (other than Luna this time) with the same features and cannot find anything. Yes, there is the Grin Satiator or whatever it is called but like so many Grin products it's way over priced. What else is out there? What am I missing?