National Battery NBX12-540 High Performance UPS Replacement
Couldn't load pickup availability
⚠️ Quick Reminder
🔹 Please ensure the original battery model number is listed in our product description and that your device model number matches for compatibility.
🔹 We only supply the batteries shown in the images. Device images are provided for reference only.
📸 Send Your Battery Photo / Unsure? Expert Help
Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.
POST YOUR IMAGE
Battery Care Guide
Battery Care Guide
Battery Usage and Maintenance Guidelines 🔋
Please read the following instructions carefully before using your new battery. Proper adherence will help ensure optimal performance and extended service life.
1. Cordless Phones, PDAs, and Power Tools (NiMH, NiCd, Lithium-Ion) 📱
Initial Charge
- Fully charge the battery overnight prior to first use.
Conditioning (First 2–6 Charge Cycles)
- Operate the device until the battery reaches approximately 20% capacity.
- Avoid premature recharging.
- Do not allow the battery to fully discharge during the initial cycles.
Post-Conditioning
- Recharge the battery only when necessary.
- These batteries are capable of approximately 500 charge cycles:
- Once daily → ~500 days
Twice daily → ~250 days
Note: Even a partial recharge is considered a full cycle.
2. Sealed Lead Acid (SLA) Batteries 💡
- No conditioning required.
- Maintain the battery in a fully charged state; avoid complete discharge.
- Capable of 300–400 charge cycles.
- Expected service life: 2–3 years, depending on usage conditions.
3. Laptop Batteries (Lithium-Ion) 💻
Initial Charge
- Fully charge the battery overnight prior to first use.
Conditioning (First 2–6 Charge Cycles)
- Charge fully, then discharge to approximately 20% capacity.
- Avoid complete discharge, as some devices may not detect a fully drained battery.
Post-Conditioning
- Minimize frequent plugging and unplugging.
- Allow the battery to discharge moderately at least once per month to maintain optimal performance.
- Occasional cycling is recommended to sustain battery health.
Professional Recommendation
Adhering to these guidelines will enhance battery longevity and ensure reliable performance.
For further assistance regarding your battery or order, our customer support team is available to provide guidance.
Delivery and Shipping
Delivery and Shipping
⚡ Everything You Need to Know About Shipping with BatteryWeb (USA)
We know reliable delivery matters when you need power fast. Here’s how BatteryWeb makes shipping easy across the USA:
🚚 Shipping & Delivery
Most orders ship next business day (some products like sealed lead acid may take a little longer).
Same-day shipping available if you order before 11:59 AM (delivery depends on the carrier).
We ship nationwide using FedEx, UPS, USPS, DHL, and regional ground carriers.
Shipping costs are calculated automatically at checkout based on weight, distance, and carrier.
Transit times shown are estimates only (business days, no weekends/holidays).
🌍 Shipping Restrictions
Lithium batteries cannot be shipped by USPS or air. They must go via FedEx Ground, UPS Ground, or DHL Ground.
PO Box deliveries are only available via USPS.
At this time, we do not ship lithium batteries to Puerto Rico. NiMH, NiCd, and Alkaline can be shipped.
📦 Important Notes
Double-check your shipping address! If an incorrect address is used and the order is returned, re-shipping costs are the buyer’s responsibility.
If a product is temporarily out of stock, we’ll notify you right away with the expected restock date—or issue a refund if you prefer.
💲 Currency & Pricing
All prices are shown in USD.
Orders shipped outside the USA may be subject to local taxes, customs fees, or import duties. These are the buyer’s responsibility.
⚡ At BatteryWeb, we’re committed to getting your batteries delivered quickly, safely, and affordably—so you’ll always have the power you need, when you need it.
Disclaimer
Disclaimer
⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.
🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
🔹 Our products are generic replacement parts and are not affiliated with, endorsed by, or manufactured by the original equipment manufacturers (OEMs).
Volts & Amps
12 Volts | 159 Ah
Terminal Type
Internal Thread
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.
-
Voltage
-
Amp Hours
-
Terminal Type
-
Length (in.)
-
Width (in.)
-
Height (in.)
-
Weight (lb.)
-
Warranty
-
Type
-
Manufacturer
-
Brand Replacement
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.