During the battery charging process, a large portion of electrical energy transforms to chemical energy. As a charging battery nears full charge, its terminal voltage rises and/or the charging current falls – depending on the type of charger used. After the battery has reached a full state of charge, any additional charging will generate heat, and some water is consumed by electrolysis causing hydrogen and oxygen gasses to be released from the battery. The excess heat is damaging to the plates (grids and paste) and separators, whereas the loss of water lowers the electrolyte level and increases the specific gravity of the electrolyte. All of these factors can contribute to shorter battery life.