Charger is Blue Smart IP68 24/5. Can anyone explain why after 2 hours into an 8hr hr float charge, the terminal voltage drops from 28v to 27.5 volts, and yet there is no change of status displayed on the charger? I am monitoring terminal voltages for 2 x 12V, 120 AHr brand new series connected Gel batteries using a LASCAR USB, 0-30V data monitor. What causes this specific change and is it part of the dynamic program of the charger - as this seems to occur with two different units, I wonder why this occurs. Thanks BuddyforGWSR