I beg to differ on the VRLA batteries. The key operational portion of the battery is the fact that it is sealed. Once the battery has been opened, the hydrogen and oxygen produced when the battery gasses, escapes. This loss of gas equates to a loss of liquid, which is what damages the battery. Like any other battery, if you dry out a portion or all of a plate, you have lost capacity, even if you recover the plate.
Eric.
