Loss of electrolyte: The loss of electrolyte eventually reduces
the effective internal surface area of the battery and
the consequence is an increase of internal resistance. The
battery can be recovered simply by the addition of distilled
water to replace that which was lost. Batteries that are sealed
such as the VRLA types do not allow additional water to be
added. In these batteries, this failure mode is irreversible. It
should be noted that these batteries lose water at such a low
rate that there is no need to add additional water through
out the life of the battery. However, since the water loss
is temperature dependent, this failure mode would be most
prevalent is warmer climates. Flooded battery designs allowing
access to the electrolyte offer a considerable advantage
here