The Higher Upfront Cost of Li-Ion UPS Batteries Pays for Itself — Here’s the Proof

Lithium-Ion UPS Batteries vs VRLA: Total Cost of Ownership Guide

By Molly Gross, Principal, Power Solutions, LLC

Lithium-ion UPS batteries cost more to buy. For most applications, they cost less to own. Our guide, Lithium-Ion UPS Batteries: A Complete Guide to TCO, Safety, and Making the Right Choice for Your Infrastructure, provides the data you need to justify the investment to decision makers, including an honest look at when the math doesn’t favor Li-ion.

The guide compares Li-ion and VRLA across the factors that affect true cost: 10-year vs. 3–5 year battery service life, replacement cycles, a 30–50% smaller footprint and about 60% less weight, integrated battery management systems, maintenance and third-party monitoring costs, recharge time, and runtime requirements. Power Solutions is a vendor-neutral advisor and supplier for both battery technologies.

Whitepaper Summary

Q: How long do lithium-ion batteries last in UPS applications compared to VRLA?

A: Li-ion UPS batteries have a service life of about 10 years, so over a standard 10-year UPS lifecycle they typically need no mid-cycle replacement. VRLA batteries typically need replacement every 3–5 years, or two to three times over the same period.

Q: How much space can be saved by switching to lithium-ion UPS batteries?

A: Li-ion battery cabinets are typically 30–50% smaller and about 60% lighter than equivalent VRLA configurations. In co-location and space-constrained facilities, that reclaimed floor space has a direct dollar value.

Q: What is the total cost of ownership advantage of lithium-ion over VRLA?

A: For UPS systems sized for a few minutes of runtime, which is the most common design, Li-ion typically delivers a lower 10-year TCO once avoided battery replacements, reduced maintenance, third-party monitoring costs, and floor space are included. For extended runtime of 20 minutes or more, the larger battery string can erase that advantage, so we recommend a site-specific analysis.

Q: Do lithium-ion UPS batteries include battery management systems?

A: Yes. Li-ion UPS batteries include an integrated BMS that monitors every cell’s voltage and temperature, estimates state of health and remaining runtime, and disconnects the affected battery module or cabinet if it operates outside safe limits.

Q: Are lithium-ion batteries available for both single-phase and three-phase UPS?

A: Yes. Lithium-ion battery options are available for both single-phase and three-phase UPS equipment from major manufacturers including Schneider Electric (APC) and Eaton.

Download this whitepaper.