Which model offers better efficiency and what does battery chemistry mean for long-term operating cost?

The GXT5LI-2000LVRT2UXL (lithium-ion) is rated at up to 92% efficiency in online mode and up to 98% in Active ECO Mode. The GXT5-2000LVRT2UXL (lead-acid) is rated at up to 95% efficiency in online mode and up to 98% in Active ECO Mode. In standard online mode—the topology that delivers true double-conversion protection—the lead-acid GXT5-2000LVRT2UXL holds a 3-percentage-point efficiency advantage (95% vs 92%). Both units reach 98% in Active ECO Mode, meaning that advantage disappears if ECO Mode is acceptable for the load.

The lithium-ion chemistry in the GXT5LI carries the UL 1973 and UL 1642 certifications not listed for the GXT5, indicating the battery pack has been independently tested to lithium-specific safety standards. Lithium-ion batteries typically support more charge-discharge cycles and a longer service life than VRLA, which can reduce battery replacement frequency and associated maintenance costs over the UPS service life—though neither spec sheet quantifies cycle count or battery service life explicitly.

How do the two units compare in physical footprint, weight, and installation environment?

Both units share the same 2U rack/tower form factor with identical height (3.4 in) and width (16.9 in). Depth differs slightly: the GXT5LI measures 18.7 in versus 18.5 in for the GXT5, a 0.2-in difference unlikely to affect rack selection in practice.

Weight is the more meaningful physical delta. The GXT5LI-2000LVRT2UXL weighs 39.7 lbs, while the GXT5-2000LVRT2UXL weighs 47.5 lbs—a 7.8 lb (roughly 16%) reduction attributable directly to the lithium-ion battery pack. For high-density deployments where multiple UPS units stack in the same rack, or where a single technician must install the unit without a lift, the lighter lithium-ion model is operationally significant.

Operating temperature range is identical for both: 32°F to 104°F (0°C to 40°C). The GXT5LI spec additionally notes a 10% derating at 50°C; the GXT5 spec does not mention an elevated-temperature derating, though this may reflect a difference in documentation rather than a confirmed capability difference.

What are the differences in interface options, output receptacle configuration, and certifications?

Both units share the same core management architecture: USB, RS232, a dry-contact terminal block, and an optional Vertiv Liebert IntelliSlot RDU120 network card for SNMP and web management. The GXT5-2000LVRT2UXL additionally lists RS485 and an external battery connector in its interface options; neither of these appears in the GXT5LI spec. RS485 support on the GXT5 enables integration with building management systems and daisy-chaining scenarios that RS232 alone does not support.

Output receptacle counts are functionally equivalent: both provide one L5-20R twist-lock and six 5-20R standard outlets (7 total). The GXT5 spec explicitly identifies four of the six 5-20R outlets as individually programmable (load shedding / sequencing), with the remaining two 5-20R and the L5-20R as non-programmable. The GXT5LI spec does not call out programmable receptacles individually; buyers requiring confirmed per-outlet control should verify this with Vertiv documentation.

Input wiring is stated as L5-20P for the GXT5LI. The GXT5 spec lists wiring in Portuguese (NBR 14136 / NBR 14316 connectors), which are Brazilian standard plugs—this appears to be a documentation localization artifact rather than a product difference, since the GXT5 is marketed for North American 120V use. Buyers should confirm correct input plug type with Vertiv before ordering. Certification differences: the GXT5LI adds UL 1973 and UL 1642 (lithium battery safety standards) not present on the GXT5; the GXT5 adds CSA 22.2 No. 107.1 (Canadian standards) not listed for the GXT5LI.

Which should you choose: the GXT5LI-2000LVRT2UXL or the GXT5-2000LVRT2UXL?

Our take: The GXT5LI-2000LVRT2UXL is the stronger choice when minimizing weight, reducing long-term battery maintenance, and meeting lithium-specific safety certifications (UL 1973, UL 1642) are priorities. Its 39.7 lb weight saves 7.8 lbs over the GXT5-2000LVRT2UXL's 47.5 lbs—meaningful for dense rack builds. However, in standard online double-conversion mode the GXT5-2000LVRT2UXL holds a 3-point efficiency edge (95% vs 92%), which translates to measurable heat and energy cost differences at sustained load. The GXT5 also lists RS485 and an external battery connector absent from the GXT5LI spec, and carries CSA certification for Canadian deployments. Choose the GXT5LI for environments prioritizing lighter weight, longer battery service life, and lithium safety compliance. Choose the GXT5-2000LVRT2UXL for installations where online-mode efficiency, RS485 integration, confirmed per-outlet programmability, or Canadian certification are required.

Side-by-Side Comparison

Spec-for-spec, from manufacturer data.

Frequently Asked Questions

Related Resources

• Vertiv GXT5LI-2000LVRT2UXL product page — full specs and to add to a quote
• Vertiv GXT5-2000LVRT2UXL product page — full specs and to add to a quote