The Auto-filling system is a system that adapts to the battery so that the fluids are filled automatically. Its main advantages are:
Efficiency as the caps don’t need to be removed by hand and fluids filled in manually.
Accuracy as the electrolyte is reliably maintained exactly at the same level for all cells.

Safety as there is no risk of injury from the user’s retention over the battery for a long time, as required by manual fluid filling.

Time saving as the amount of time required to fill the battery is reduced considerably.