Translations:Fonctionnement, entretien et régénération de batteries au plomb/51/en

• Drying of the electrolyte: Naturally, the water contained in the electrolyte evaporates a little. Valve regulated lead acid (VRLA) batteries promote its recondensation, which reduces the need for additional distilled water (unlike open batteries). But, once the battery is charged, a supply of current initiates the electrolysis of the water with the formation of oxygen and hydrogen gas. In a VRLA battery, beyond a certain pressure, safety valves let the water escape permanently. This is problematic because topping up with distilled water is not possible.

How to avoid it ?

• Avoid overloads: check the data sheets to ensure that the load currents and durations are not too high.
• Avoid high temperatures: ventilate or insulate the battery room, leave space between each battery.