This 9PX rack-mount online double-conversion UPS system provides reliable battery backup and AC power protection against blackouts, brownouts, surges, and line noise that can damage valuable IT equipment or destroy data. The 9PX3000GLRT provides superior power management for education, commercial, financial, and healthcare networking components, including Cisco switches and servers. Expandable Internal Battery Backup Keeps You Operational Through Power Outages. The field-replaceable, hot-swappable valve-regulated lead-acid (VRLA) battery modules allow you to work through short power failures and give you enough time to safely save files and shut down your system during a prolonged blackout. Exclusive ABM technology increases battery life by 50 percent and closely monitors battery health to provide advanced notice when batteries need replacing. You can also connect up to four extended battery modules (9PXEBM72RT, sold separately) for hours of extended runtime.