We offer a wide range of sealed maintenance-free (SMF) batteries that require no water. SMF batteries look different from other types of batteries. They are more compact because there is no free electrolyte (it is used in gel form, filling the plate cavities), making them more volume-efficient and taking up less space for their energy storage capacity. Because they are filled with electrolyte only once during activation, there are no filler caps. Instead, a sealing plug permanently covers the filler ports. Additionally, there is no vent tube on this type of battery. The design of this battery allows any released internal gas to recombine within the battery, eliminating the need for a vent tube. The SMF battery can be sealed because the negative plates inside the battery never fully charge and therefore do not produce hydrogen gas. The positive plates create oxygen during the discharge process, but instead of expelling the oxygen through a vent tube, it reacts with the charged active material on the plates to form water. This process continues until the battery is fully charged, at which point the water transforms into acid. This process is called recombinant technology, and this design is what makes our batteries unique. A “factory activated” battery requires no filling before installation. An extensive activation process ensures complete electrolyte absorption, so there is no liquid acid inside the battery. This process allows these batteries to be shipped from the factory ready for installation.<\/p>\n