Preserve uptime for demanding infrastructure with the APC Smart-UPS Online Lithium SRTL5KRM2UT. This 208 V, 5,000 W online UPS is built for teams that need compact rack or tower deployment without giving up power quality or runtime confidence. Lithium-ion battery architecture changes the economics of backup power. Compared with traditional lead-acid systems, it is designed for longer service life and lower maintenance burden, making it a strong fit for sites where battery replacement windows are limited or operational overhead matters. The 2U rack/tower format gives you flexibility in constrained spaces, whether the unit is installed in a server rack, edge closet, or mixed-use IT room. As part of the Smart-UPS Online family, this model is intended for critical loads that cannot tolerate transfer interruptions or poor power conditioning. It is a better choice than lower-tier UPS systems when the cost of downtime, maintenance, and space inefficiency outweighs the initial purchase price. For infrastructure teams standardizing on 208 V power, it delivers a compact, high-value backup platform for modern IT environments.