HPB batteries are maintenance-free Valve Regulated Lead Acid Batteries with self-regulating one-sided safety valves and internal gas recombination. The batteries are made in AGM (Absorbent Glass Mat) technology; the electrolyte is held in the glass mat. The technology used allows installing batteries in places with natural (gravity) ventilation and minimizes maintenance. They are dedicated for devices requiring emergency power to a load when the input power source or mains power fails, such as: buffer power supplies used, among others, in CCTV systems, alarm systems (Intrusion Detection Systems, IDS), and access control systems (ACS), UPS units, etc... Nominal voltage: 12 VDC. Nominal capacity: 28 Ah. Projected lifespan: 5 to 8 years at 20°C. Charging current: Recommended xx Amp, Maximum xx Amp. Dimensions: W=175, H=125, D=166 [mm, +/-2].