We offer a vast range of Sealed Maintenance Free Batteries(SMF) with no requirement to add water and it’s completely sealed. SMF batteries look different than other battery types. They are more compact because there is no free electrolyte(it is used in the form of gel which files the cavity of plates) making them more “volume efficient” and taking less space for their energy storing capacity. Because they are filled with electrolyte only one time during activation, so there are no filler caps. Instead a sealing plug permanently covers the filler ports. Also, there is no vent tube in this battery.
The construction of this type battery causes internal freed gas to recombine inside the battery, so no vent tube is required. SMF battery can be sealed because inside the battery, the negative plates are never fully charged and therefore don’t produce hydrogen gas. The positive plates create oxygen during the discharge process but instead of the oxygen being forced out a vent tube, it reacts with the charged active material on the plates to become water until the battery is charged and the water is transformed into acid. This process is called recombinant technology and this design is what makes our batteries unique.
A “factory activated” battery does not require filling before installation. An extensive activation process ensures complete absorption of the electrolyte so no liquid acid is contained within the battery. This process allows these batteries to be shipped from the factory ready to install.