I wonder if it would be safe to charge a 36V Li-ion battery with a Luna 48V Li-ion battery charger set at 80%. The 48V Luna charger will charge a 48V battery to 54.6V when set at 100%. 54.6V multiplied by .8 = 43.68V. The 36V battery should be fully charged at 42V. The 36V battery has a BMS. The Luna charger will charge at 1V, 2V, 3V, 4V or 5V.