How To Add Water To Lead Acid Battery. The most common cause of malfunction of old batteries is sulfated plates. Anyone who has a set of deep-cycle flooded lead-acid batteries knows that proper maintenance includes checking the water level in each cell after a full charge.

The fluid in your lead-acid battery is called electrolyte. After charging add enough water to bring the level to the bottom of the vent about ¾ below the top of the cell. Thanks for so much valuable information.
Its important to note that battery owners should never add sulfuric acid to their battery.
Which begs the question. How often you need to replenish water in a lead-acid battery depends on how often you use it. We will analyze the main failures of the batteries and find out how to fix them. You need to ensure the acid level in your battery is occasionally topped up as once the acid level falls below a certain level the cells go dead.

