Long-life lithium UPS systems built for demanding environments
LiFePO₄ battery technology changes the ownership model: instead of replacing lead acid batteries every 3–5 years, these systems are designed to stay in service for the life of the infrastructure they protect.
Find the right model for your deployment
Six models cover the full range of lithium single phase applications — from ultra-slim embedded installs to high-density rack deployments. The table below shows the key differences. If your situation doesn’t fit cleanly, talk to a specialist before specifying.
| Model | Capacity | Voltage | Architecture | Form factor | Best for |
|---|---|---|---|---|---|
| J60View product → | 350VA, 600VA | 120V or 230V | Standby | Ultra-slim, fanless. Wall, DIN rail, or flat mount. | KiosksDigital signageEmbedded installs |
| J60CView product → | 350VA, 600VA | 120V or 230V | Standby | 1U short depth. Rack or wall mount. | Structured wiringShallow cabinets |
| P91LiView product → | 1.5kVA, 2kVA, 3kVA | 120V | Online | Rack or tower convertible. | Edge ITNetworkMedical |
| P91gLiView product → | 1.5kVA, 2kVA, 3kVA | 208V / 230V | Online | Rack or tower convertible. | Higher voltage ITInternational |
| J90View product → | 1kVA, 2kVA, 3kVA | 120V | Online | 1U high density. Rack or wall mount. Switchable outlets. | High-density rackAdvanced monitoring |
| J90iView product → | 1kVA, 2kVA, 3kVA | 208V / 230V | Online | 1U high density. Rack or wall mount. Switchable outlets. | Global deployments230V rack |
Six models. One platform philosophy.
Every model uses LiFePO₄ chemistry and is designed to eliminate routine battery replacement. The differences are form factor, voltage, and protection architecture — matched to the deployment environment.
Designed for installations where a conventional UPS physically cannot fit — behind kiosk displays, inside digital signage enclosures, or on DIN rails in compact control panels. Wall, DIN rail, or flat mount. No fan means no noise and no moving parts to maintain.
Short depth 1U form factor solves the installation constraint that makes traditional rack UPS impractical in shallow wiring cabinets, telecom enclosures, and wall-mount panels. Rack or wall mount. Same LiFePO₄ chemistry as the broader J60 family.
Double-conversion online architecture provides continuous clean power to switches, servers, and communications equipment regardless of utility conditions. Rack or tower convertible. 120V. The lithium platform eliminates the maintenance cycle that makes lead acid UPS deployments in edge locations expensive to manage.
208V and 230V online lithium protection for commercial IT environments, international deployments, and installations where higher voltage distribution is standard. Rack or tower convertible. Identical protection architecture to the P91Li with voltage flexibility for global use cases.
High-density 1U online lithium UPS for rack environments where space is at a premium. Switchable outlets enable load management and remote control. Advanced monitoring for visibility into battery health, load, and runtime. Wall or rack mount. 120V.
International version of the J90 for global infrastructure deployments and 230V rack environments. Identical monitoring capability, outlet control, and 1U footprint. Wall or rack mount. Supports global infrastructure requirements where 208V or 230V distribution is standard.
Why LiFePO₄ outperforms lead acid over the life of a deployment
The performance advantage of lithium iron phosphate is not primarily about a single spec — it’s about how the battery behaves over thousands of cycles and across a wide temperature range. Lead acid batteries degrade fastest precisely in the conditions where UPS systems are most often deployed.
LiFePO₄ (lithium iron phosphate)
- 3,000–5,000 discharge cycles at standard depth
- Maintains capacity in elevated temperatures
- Thermally stable — no thermal runaway risk
- Consistent performance through full discharge range
- Integrated BMS for real-time cell monitoring
- Higher energy density enables compact form factors
Sealed lead acid (VRLA)
- 200–500 cycles at standard depth before significant degradation
- Capacity drops rapidly above 25°C operating temperature
- Sulfation and stratification accelerate with age and heat
- Significant capacity loss in final 20% of discharge range
- Replacement typically required every 3–5 years
- Heavy and bulky — limits form factor options
Where lithium UPS systems are deployed
The common thread across these applications is environments where battery replacement is costly, disruptive, or impractical — and where a smaller, lighter form factor solves a real installation problem.
Ultra-slim fanless form factor mounts behind displays and on DIN rails inside enclosures. Silent operation suits public environments. No battery replacement for the life of the kiosk.
J60 product page →
Short depth 1U form factor fits where standard rack UPS cannot. Eliminates the workaround of under-sizing protection to fit the enclosure.
J60C product page →
Online double-conversion protection for switches, servers, and communications gear at distributed sites where a technician visit for battery replacement is expensive and disruptive.
P91Li product page →
High temperature tolerance and long service life suit industrial environments where ambient temperatures are elevated and unplanned maintenance is costly. Select models rated to 50°C.
J90 product page →
Online double-conversion provides clean, conditioned power for sensitive equipment. Long battery service life reduces maintenance intervention in clinical environments where equipment access is restricted.
P91Li product page →
208V and 230V models support global deployments with the same lithium platform advantages. J90i adds switchable outlet control for international rack environments.
P91gLi product page →Understanding the warranty and battery life figures
Battery service life and product warranty are different figures and are sometimes confused. Here’s what each means for a lithium UPS deployment.
Battery service life projections are based on LiFePO₄ chemistry characteristics under controlled conditions. Actual service life varies with operating temperature, depth of discharge, charge cycle frequency, and installation environment. Deployments in elevated temperature environments should use the high-temperature warranty figures for planning purposes.
Common questions about lithium UPS systems
LiFePO₄ batteries are rated for 3,000–5,000 discharge cycles and can remain in service up to 15 years in ideal operating conditions (25°C or below, moderate discharge depth). In elevated temperature environments — above 40°C continuous — service life is reduced and warranty coverage changes accordingly. Compare this to sealed lead acid batteries, which typically require replacement every 3–5 years under similar conditions.
Select models operate reliably to 50°C (122°F). This is a meaningful advantage over lead acid systems, which begin losing capacity above 25°C and can fail prematurely in environments that regularly reach 35–40°C. Note that installations operating continuously above 40°C carry a 2-year warranty rather than the standard 5–6 year coverage.
LiFePO₄ (lithium iron phosphate) is the most thermally stable of the common lithium battery chemistries. It does not exhibit thermal runaway under normal operating conditions — the failure mode associated with some other lithium-ion chemistries. All models include integrated battery management systems that monitor cell voltage, temperature, and charge state.
Standby UPS (J60, J60C) passes utility power directly to the load during normal operation and switches to battery during an outage — with a brief transfer time. Online double-conversion UPS (P91Li, P91gLi, J90, J90i) continuously converts power through the inverter, providing clean, conditioned power at all times with zero transfer time. Online protection is recommended for sensitive IT equipment, medical devices, and any load that benefits from continuous power conditioning rather than just outage protection.
The primary advantage is lifecycle cost. A lead acid UPS requires battery replacement every 3–5 years — parts, labor, and downtime. A lithium UPS deployed in the same location may not require battery replacement for 10–15 years. Additional advantages: significantly smaller and lighter at equivalent capacity, faster recharge after outages, and better performance in elevated temperature environments. The higher upfront cost of a lithium UPS is typically recovered within 5–7 years when battery replacement costs are factored in.
Yes — for enterprise and data center applications requiring three-phase lithium UPS protection, Xtreme Power offers the Li90 modular lithium platform from 10kW to 30kW. Learn more about the Li90 →
More from Xtreme Power
Talk to a lithium UPS specialist
Model selection, runtime sizing, installation guidance, and competitive replacement recommendations — from people who know the product line.