Feature: Sealed construction: HB batteries?unique constrction and sealing technique ensure that no electronlyle leakage can occur from the battery terminals or cases. Maintenance-free design: HB batteries are lead acid batteries that facilitates an oxygen recombination cycle.since the oxygen generated is almost completely recombined within the cell.there is no need for the periodic addition of water.consequently.the batteries are maintenance-free in terms of electrolyte maintenance-that is,there is no requiement nor capacity to add water to the batteries or to measure the electrolyte specific gravity Superior high rate performance: Due to its very low internal resistance HB batteris are capatable of extremently high rates discharge performance. High energy density: By using special design of immobilized electroyle and compact assembly technique ,HB batteries can achieve higher energy than most of the contemporary lead aicdbatteries with the same volume Low self-discharge: Through the use of the high purity materials ,and additive HB batteries are able to maintain a loss of capacity under 3% per mouth when stored and not in use. High recovery capability: By using special formulated electtroyle .HB batteries have an excellent charge acceptance and recovery capability even after deep discharge.