This document discusses UPS (uninterruptible power supply) batteries and their importance in protecting devices like PCs from power issues. It explains that a UPS can provide backup power to a PC during outages, surges, sags and other electrical problems to prevent data loss or hardware damage. It also describes the benefits of sealed lead acid batteries typically used in UPS systems and factors that affect battery life, such as overcharging, overheating and cable damage. The summary concludes that UPS batteries are essential for protecting data and preventing disruptions across many industries.