AMP-Tech batteries use oxygen recombination technology and are all maintenance-free batteries. They have a special grid alloy that produces less gassing and less self-discharging providing a longer cycle life. High-quality AGM separators provide additional extended cycle life and prevent micro short circuits. ABS material increases the strength of the battery container. In addition, Amp-Tech has VRLA batteries designed for Security & Small Power supplies such as NBN batteries and Home alarm systems. Features & Benefits Using Oxygen Recombination Technology; Maintenance Free PbCaSn Alloy for Plate Grids; Less Gassing, Less Self-Discharging High-Quality AGM Separator; Extend Cycle Life & Prevent Micro Short Circuit ABS Material; Increase the Strength of Battery Container High Purity Raw Material; Ensure Low Self Discharge Rate