Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com

WELCOME5
SigmasTek  |  SKU: BW-0019

APC S400XLTNET High Performance Replacement Battery By SigmasTek 50.64 lb

24% off
New arrival
Sale price $216.99 USD Regular price $284.99
Shipping calculated at checkout.
SigmasTek 12V 18Ah NB battery for APC S400XLTNET UPS
Durable design ensures reliable backup power
Nut & bolt terminals for secure connection
Compatible and built for long service life
In stock

— Ready to ship immediately

Free shipping

Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe

Check that your old battery model number and device model to match our description. This makes sure they work together.


We ship your order same day if you buy it before 4 PM EST.

Send Your Battery Photo

Expert Technician 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 BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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.


Volts & Amps

12 Volts | 18 Ah

Terminal Type

Nut & Bolt

SigmasTek 12V 18Ah NB Replacement UPS Battery — Compatible with APC S400XLTNET

Replace depleted batteries in your APC S400XLTNET with the SigmasTek 12V 18Ah NB battery for reliable backup power and consistent UPS performance. This replacement UPS battery is engineered for durability and dependable operation, giving your UPS the capacity it needs to protect servers, network equipment and essential electronics from unexpected outages. For anyone seeking a high-performance UPS battery for the APC S400XLTNET, this SigmasTek unit delivers dependable results.

Key Specifications

  • Brand: SigmasTek
  • Voltage: 12V
  • Capacity: 18Ah
  • Terminal Type: NB (Nut & Bolt)
  • Compatibility: Designed for APC S400XLTNET
  • Features: Reliable and durable

Benefits

This SigmasTek battery is manufactured to be a long-lasting battery option for APC S400XLTNET UPS systems. The NB (Nut & Bolt) terminal configuration ensures a secure mechanical and electrical connection, reducing the risk of loose contacts and providing stable performance under vibration or movement. As a high-performance UPS battery, it supports consistent discharge rates and dependable energy delivery during power interruptions, which is essential for protecting critical loads and enabling controlled shutdowns.

Durability and reliability are central to its design: the SigmasTek 12V 18Ah is suitable for repeated charge/discharge cycles typical of standby UPS service. Typical applications include data closets, telecom racks, medical equipment power support, and general UPS emergency power for small to medium installations. By choosing a replacement UPS battery like this SigmasTek model, you invest in continued uptime and lower lifecycle costs through fewer replacements and stable runtime.

The straightforward installation process minimizes service time, allowing IT staff or technicians to swap the battery quickly and return the UPS to full protection. Its OEM-style compatibility with the APC S400XLTNET ensures correct fit and electrical behavior.

Ready to restore full backup capability to your APC S400XLTNET? Purchase the SigmasTek 12V 18Ah NB high-performance UPS battery now and secure reliable, long-lasting power for your critical systems.

Technical Specifications

Voltage12 Volts
Amp Hours18 Ah
Terminal TypeNut & Bolt
Length (in.)7.13
Width (in.)3.0
Height (in.)6.59
Weight (lb.)50.6

Product Highlights

  • Brand Replacement : APC S400XLTNET
  • Manufacturer: SigmasTek
  • Product Type: UPS Batteries
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.