For questions, quotes, or help finding the right battery, feel free to email us at sales@batteryweb.com

New collections added! Learn more

🎉 First Order Special 🎉

First-time shoppers get 5% OFF on batteries & accessories!

WELCOME5
SigmasTek  |  SKU: BW-4361

APC SRT1500RMXLA-NC UPS High Performance Replacement Battery Set

Sale price $92.99 USD Regular price $135.15
Shipping calculated at checkout.

➤ Includes 8 brand new SigmasTek SP12-5.5HR batteries (12V 5.5AH)

➤ High rate discharge design for reliable short-term power output

➤ Valve regulated, spill-proof construction for safe operation

➤ Low self-discharge ensures longer shelf life and readiness

➤ UL recognized and CE certified for quality and safety compliance


📦🚀 FAST SHIPPING: Usually ships same day if ordered before 2 PM EST

⚠️ 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 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

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: 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 | 5.5 Ah

Terminal Type

F2

Replacement Battery Set for APC SRT1500RMXLA-NC UPS (8 x SigmasTek SP12-5.5HR)

Restore full runtime and reliability to your APC SRT1500RMXLA-NC with this compatible replacement UPS battery set. Designed for demanding, high-rate discharge applications, these brand new SigmasTek SP12-5.5HR batteries deliver consistent performance and dependable emergency power when you need it most. Whether you’re maintaining a data center UPS, supporting critical network gear, or preparing backup systems for unpredictable outages, this replacement UPS battery kit is engineered to match the power profile of your original configuration while offering long-lasting battery life and superior vibration resistance.

Key Specifications

  • Battery Brand: SigmasTek
  • Battery Model: SP12-5.5HR
  • Quantity: 8 batteries (replacement set)
  • Voltage: 12 Volts
  • Capacity: 5.5 AH (Amp-hours)
  • Terminal Type: F2
  • Design: High Rate Discharge Design
  • Construction: Valve Regulated Spill Proof Construction
  • Features: Low Self-discharge, High Vibration Resistance
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year Warranty

Benefits

This high-performance UPS battery set is built for durability and reliable operation under heavy loads. The high rate discharge design allows the batteries to supply larger power bursts for short periods—ideal for UPS units that must sustain surge loads or support inrush currents. Valve regulated, spill-proof construction and low self-discharge provide safer handling, extended shelf life, and reduced maintenance compared with flooded alternatives. High vibration resistance ensures stable service in rack-mounted UPS systems or mobile environments where mechanical shock could affect lesser batteries.

As a replacement UPS battery option, this kit provides a long-lasting battery solution for critical power applications: uninterruptible power supply units, emergency power systems, and battery-powered tools that require fast, dependable power delivery. Each battery is factory fresh and tested to meet or exceed OEM performance standards so your APC SRT1500RMXLA-NC returns to peak reliability without compromise. This set requires the use of your existing cables and mounting hardware from the original configuration for installation.

If you’re searching for a high-performance UPS battery that balances sustained output with long service life, this SigmasTek set for the APC SRT1500RMXLA-NC is an excellent, cost-effective choice. Buy with confidence and restore protection for your equipment today—orders for in-stock items typically ship within 24 hours.

Ready to upgrade? Purchase this replacement UPS battery kit for the APC SRT1500RMXLA-NC now and secure reliable emergency power and extended runtime for your critical systems.


Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • 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.