Stationary lead-acid batteries are designed to provide power during a mains power outage. Batteries are capable of maintaining power to the load for both a few seconds and many hours. Batteries with lead-antimony alloy flat plates have increased specific characteristics. They guarantee long and reliable operation and are virtually maintenance-free. Batteries are supplied by the company both in a dry-charged state and filled with electrolyte and ready for operation Technical Specifications OP : Capacity (C10): 73 Ah to 1,150 Ah Voltage: 2 В Continuous charging voltage: 2.23 V/El Number of charge-discharge cycles: 1200 Delivery type: Dry version/filled with electrolyte Features: Transparent SAN housing Water refilling every 1 to 3 years The use of modern filter plugs allows the construction to be explosion-proof and reduces the amount of water refilling. In the OP series accumulator produced by NovAK a positive electrode contains arsenic-tin ligature and a patented paste composition. The electrolyte is a solution of sulfuric acid. The density of the electrolyte of a fully charged battery is 1.240+0.010 g/cm3 at 20°C. Constant charging voltage is 2.23+0.01 V/El at 20 °C.