Box Design Theory

12v Starting batteries AC charger get's voltage up

Battery Notes: Fulling Charged Resting Voltage

36v Lith: 42v
24v Lith: 29.2v
12v AGM: 12.89v
12v Sealed Lead Acid: 12.9v
12v Flooded: 12.6v

Voltage while being charged?
12v Sealed Lead Acid: 12.9~14.1v