Flooded Lead-Acid Batteries (FLAs) are available in a wide variety of sizes, due to their use in many applications. They are reliable and durable in harsh environments. FLAs do not reconstitute hydrogen and oxygen gases in the water, as in Valve Regulated Lead-Acid Batteries (VRLAs). Thus, they need adequate available space for ventilation and removal of hydrogen gases from the battery area. FLA batteries need more care than VRLA batteries. For example, distilled or deionized water must be replenished systematically to compensate the loss of moisture (hydrogen and oxygen).