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— the simplest type of UPS, designed solely for safety net: in the event of a critical increase / decrease in mains voltage, the load is switched to the battery. The battery life usually lasts for several minutes, which is enough, for example, to save data and safely shut down the PC. Such UPSs can also serve as a stabilizer, compensating for power surges in the network, however, they are poorly suited for unstable networks, because. the battery wears out quickly. Usually they have low power and are designed to power 1-3 devices (1 workplace).