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.
15 yr
Battery service life
ideal operating conditions
5,000
Discharge cycles
vs ~300 for lead acid
50°C
Max operating temp
select models
4×
Faster recharge
vs comparable lead acid
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 |
|---|---|---|---|---|---|
| J60 View product | 350VA, 600VA | 120V or 230V | Standby | Ultra-slim, fanless. Wall, DIN rail, or flat mount. | Kiosks / Digital signage / Embedded installs |
| J60C View product | 350VA, 600VA | 120V or 230V | Standby | 1U short depth. Rack or wall mount. | Structured wiring / Shallow cabinets |
| P91Li View product | 1.5kVA, 2kVA, 3kVA | 120V | Online | Rack or tower convertible. | Edge IT / Network / Medical |
| P91gLi View product | 1.5kVA, 2kVA, 3kVA | 208V / 230V | Online | Rack or tower convertible. | Higher voltage IT / International |
| J90 View product | 1kVA, 2kVA, 3kVA | 120V | Online | 1U high density. Rack or wall mount. Switchable outlets. | High-density rack / Advanced monitoring |
| J90i View product | 1kVA, 2kVA, 3kVA | 208V / 230V | Online | 1U high density. Rack or wall mount. Switchable outlets. | Global deployments / 230V 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.
Standby · Embedded · DIN rail
J60 Ultra-Slim Lithium UPS
350VA · 600VA · 120V or 230V
The only UPS that fits behind a display or on a DIN rail. Fanless design enables silent operation in public-facing environments.
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.
FanlessWall / DIN / flat mount120V or 230V View J60 →
Standby · Structured Wiring · Short depth
J60C 1U Short-Depth Lithium UPS
350VA · 600VA · 120V or 230V
Fits structured wiring cabinets where standard 1U UPS units are too deep to install.
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.
1U short depth / Rack or wall mount / 120V or 230V
Online · Edge IT · 120V
P91Li Online Lithium UPS
1.5kVA · 2kVA · 3kVA · 120V
Online double-conversion protection with lithium service life — no battery replacement for the life of the deployment.
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.
Online double-conversion / Rack or tower / 120V
Online · Commercial · 208V/230V
P91gLi Online Lithium UPS
1.5kVA · 2kVA · 3kVA · 208V/230V
Same platform as the P91Li — higher voltage for commercial installations and international deployments.
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.
Online double-conversion / Rack or tower / 208V / 230V
Online · High Density Rack · 120V
J90 1U Online Lithium UPS
1kVA · 2kVA · 3kVA · 120V
1U footprint with switchable outlets and advanced monitoring — more capability per rack unit than any comparable lead acid platform.
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.
1U online / Switchable outlets / Advanced monitoring / 120V
Online · High Density Rack · 208V/230V
J90i 1U Online Lithium UPS
1kVA · 2kVA · 3kVA · 208V/230V
J90 platform at 208V/230V — same advanced monitoring and switchable outlets for global rack deployments.
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.
1U online / Switchable outlets / Advanced monitoring / 208V / 230V
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.
| 15 yr Battery service life LiFePO₄ cells are rated for 3,000–5,000 discharge cycles. At one cycle per day, that’s 8–14 years of daily operation. Lead acid UPS batteries typically require replacement every 3–5 years under similar conditions. In ideal operating conditions · varies by temperature and depth of discharge | 50°C High temperature operation Select models operate reliably to 50°C (122°F). Lead acid batteries lose capacity rapidly above 25°C and can fail prematurely in environments that regularly reach 35°C or higher — exactly the environments where UPS systems protect industrial and commercial equipment. Select models · warranty reduced to 2 years above 40°C continuous | 4× Faster recharge LiFePO₄ batteries accept charge faster than lead acid, restoring protection capacity significantly faster after an outage. In environments with frequent or extended outages, faster recharge means less exposure between events. Versus comparable lead acid platform at equivalent capacity |
| 70% Smaller and lighter LiFePO₄ cells have significantly higher energy density than lead acid. At equivalent capacity, lithium UPS systems are up to 70% smaller and lighter — enabling form factors like the J60 that are simply not achievable with lead acid chemistry. Versus comparable capacity lead acid UPS · varies by model | $0 Battery replacement cost The total cost of ownership advantage compounds over time. Eliminating two or three battery replacement cycles — each requiring parts, labor, and downtime — offsets the higher initial cost of lithium in most deployments within 5–7 years. Assumes no battery replacement required over 10-year deployment | BMS Integrated safety management Every system includes an integrated battery management system monitoring cell voltage, temperature, and charge state. LiFePO₄ chemistry is inherently more thermally stable than traditional lithium-ion — it does not exhibit thermal runaway under normal operating conditions. LiFePO₄ chemistry · integrated BMS standard on all models |
| LiFePO₄ (lithium iron phosphate) | Sealed lead acid (VRLA) |
|---|---|
| + 3,000–5,000 discharge cycles at standard depth | – 200–500 cycles at standard depth before significant degradation |
| + Maintains capacity in elevated temperatures | – Capacity drops rapidly above 25°C operating temperature |
| + Thermally stable — no thermal runaway risk | – Sulfation and stratification accelerate with age and heat |
| + Consistent performance through full discharge range | – Significant capacity loss in final 20% of discharge range |
| + Integrated BMS for real-time cell monitoring | – Replacement typically required every 3–5 years |
| + Higher energy density enables compact form factors | – 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.
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
Up to 15 years
In ideal operating conditions at or below 25°C. 3,000–5,000 discharge cycles.
Standard product warranty
5–6 years
Varies by model. Covers manufacturing defects and component failure.
High temperature warranty
2 years
Applies to installations operating continuously above 40°C (104°F).
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
How long does a lithium UPS battery last?
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.
Can lithium UPS systems operate in high temperatures?
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.
Is LiFePO₄ safe compared to other lithium chemistries?
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.
What’s the difference between standby and online double-conversion?
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.
Why choose lithium over a traditional lead acid UPS?
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.
Is there a three-phase lithium UPS option?
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 →
Speak With a Lithium UPS Specialist
Get help with model selection, runtime sizing, installation guidance, and competitive replacements.
sales@xpcc.com
1 800 582 4524