Storing and Servicing Facilities Separate facilities for storing and/or servicing flooded electrolyte lead-acid and Nicd batteries must be maintained. Introduction of acid electrolyte into alkaline electrolyte causes permanent damage to vented (flooded electrolyte) Nicd batteries and vice versa. However, batteries that are sealed can be charged and capacity checked in the same area. Because the electrolyte in a valve-regulated lead-acid battery is absorbed in the separators and porous plates, it cannot contaminate a Nicd battery even when they are serviced in the same area.