National Battery NBX12-540 High Performance UPS Replacement 95.39 lb

Replacement National Battery NBX12-540 — Compatible NBX12-540

Designed as a direct, reliable replacement battery for the National Battery NBX12-540, this compatible NBX12-540 delivers dependable UPS performance when you need it most. Engineered for high-rate discharge applications, this high-performance battery provides consistent power delivery, low self-discharge, and a spill-proof design that enhances safety and reliability. Whether you’re protecting critical servers with a UPS or stocking spare power modules, the NBX12-540 replacement battery offers the durability and long-life characteristics expected from a professional-grade battery.

Key Specifications

• Model: National Battery NBX12-540 (Replacement)
• Voltage: 12 Volts
• Amp-hours: 159 Ah
• Watts per cell: 539 Watts per cell on 15-min rate at 1.67 Volts
• Self-discharge rate: Less than 3% per month
• Expected life in standby use: Up to 10 years
• Cycle life: Up to 300 cycles at 100% discharge in cycle service
• Technology: Absorbent Glass Mat Technology (AGM)
• Case: ABS (UL94 V-0) flame retardant case
• Construction: Spill Proof Construction; No-leak construction; Can be operated in any position
• Terminal: Internal Thread
• Warranty: 3 Year Warranty
• Certifications: UL Listed
• Condition: Brand New, Factory Fresh
• Brand/Supplier text: SigmasTek

Benefits

This replacement battery is built for longevity and consistent output. The Absorbent Glass Mat (AGM) design provides vibration resistance, low internal resistance, and a maintenance-free, leak-proof construction that helps ensure a safe installation in confined environments. With a self-discharge rate below 3% per month and an expected standby life up to 10 years, this long-lasting battery minimizes the need for frequent replacements. The NBX12-540’s high-rate discharge capability (539 W per cell on a 15-minute rate) makes it an ideal high-performance battery for UPS systems that demand high short-term current during outages.

Durability features such as the ABS UL94 V-0 flame retardant case and spill-proof construction add protection in critical installations. The internal thread terminal simplifies connections in standardized trays and racks. Typical applications include uninterruptible power supplies (UPS), emergency power systems, telecommunication backup, data center cabinets, and other stationary power systems requiring reliable standby power. It’s also well-suited for cycle service where controlled discharges are frequently required — supporting up to 300 full cycles.

Ready to replace your failing pack? Order this replacement National Battery NBX12-540 high-performance battery now and secure reliable uptime for your equipment. Purchase today to get a tested, factory-fresh, long-lasting battery backed by a 3 year warranty.