The CyberPower CST135XLU-R is a line-interactive Uninterruptible Power Supply (UPS) system designed to provide reliable battery backup and surge protection for sensitive electronics in small office and professional workstation environments. This unit features an intelligent LCD display that provides real-time status information, including input/output voltage, battery capacity, load percentage, and estimated runtime, allowing users to monitor power conditions at a glance. It is engineered to safeguard connected equipment such as desktop computers, networking hardware, and external storage from the damaging effects of power outages, surges, sags, and fluctuations. By delivering seamless battery-powered AC during a blackout, it provides critical time to save work and perform a graceful system shutdown, preventing data loss and hardware damage.

The CST135XLU-R utilizes automatic voltage regulation (AVR) to correct minor under-voltage (brownouts) and over-voltage conditions without switching to battery power, thereby extending battery life for true outages. Its line-interactive topology offers an efficient balance of performance and cost-effectiveness for typical office applications. The unit includes multiple outlet types, with some outlets dedicated to battery backup and surge protection, and others providing surge protection only, allowing users to prioritize essential devices for backup power. The form factor is designed for easy placement under a monitor or on a shelf, with a compact footprint that minimizes desk space usage while remaining easily accessible.

Management and connectivity are enhanced through a USB interface, enabling communication with power management software installed on a connected computer. This software can automatically save open files and safely shut down the system during an extended power failure, even if the user is not present. The UPS is user-serviceable, designed with hot-swappable batteries that can be replaced without tools or powering down connected equipment, ensuring ongoing protection with minimal downtime. For professionals and small businesses seeking a dependable, intelligently managed power protection solution with clear status feedback, the CyberPower CST135XLU-R offers a robust defense against common power problems.