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-5085

Best Power FERRUPS FE 2.1KVA UPS High Performance Replacement Battery Set

Sale price $155.20 USD Regular price $225.03
Shipping calculated at checkout.

➤ Comes with 4 new SigmasTek SP12-18HR batteries (12V, 18AH)

➤ High rate discharge design for efficient UPS backup power

➤ Valve regulated spill-proof construction for safety and reliability

➤ Low self-discharge and strong vibration resistance for durability

➤ U.L. recognized and CE certified, plus 1-year warranty included


📦🚀 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 | 18 Ah

Terminal Type

Nut & Bolt

Replacement SigmasTek SP12-18HR Battery Set for Best Power FERRUPS FE 2.1KVA UPS

Upgrade the backup power for your Best Power FERRUPS FE 2.1KVA with this complete replacement UPS battery set. Designed for high-rate discharge needs, these batteries provide reliable, high-current output, low self-discharge, and superior vibration resistance—perfect for protecting critical loads. If you require a high-performance UPS battery and a long-lasting battery replacement for the FERRUPS FE 2.1KVA, this SigmasTek set delivers trusted, factory-fresh performance.

Key Specifications

  • Included batteries: 4 x SigmasTek SP12-18HR
  • Voltage: 12 Volts
  • Capacity: 18 AH (amp-hours)
  • Terminal type: Nut & Bolt
  • Design: High Rate Discharge Design
  • Construction: Valve Regulated Spill Proof Construction
  • Feature: Low Self-discharge
  • Feature: High Vibration Resistance
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year Warranty
  • Compatibility note: Requires use of all existing cables and hardware from original configuration to connect new UPS batteries
  • Compatible UPS brand/model: Best Power FERRUPS FE 2.1KVA
  • Battery brand: SigmasTek
  • Typical applications included: Uninterruptible Power Supply (UPS) Units; Emergency Power Supply; Battery Powered Tools

Benefits

This replacement UPS battery set offers robust reliability and extended life for your FERRUPS FE 2.1KVA. The high rate discharge capability ensures the pack can deliver higher currents when short bursts of power are required, protecting critical equipment during outages. Valve-regulated, spill-proof construction enhances safety and reduces maintenance, while low self-discharge preserves stored energy during standby. High vibration resistance improves durability in both stationary and mobile setups.

As a high-performance UPS battery option, the SigmasTek SP12-18HR batteries are supplied brand new with U.L. recognition and CE certification, reflecting strict quality and safety standards. These batteries are thoroughly tested to meet or exceed OEM specifications for the Best Power FERRUPS FE 2.1KVA, making them an excellent long-lasting battery choice for data centers, offices, and emergency power systems. They are also suitable for battery-powered tools and other applications that demand reliable, short-term high current output.

When dependable backup power is essential, this kit provides a balance of certified safety, tested performance, and durable construction to keep your systems online and protected.

Secure reliable power for your Best Power FERRUPS FE 2.1KVA today—order this replacement UPS battery set now and benefit from prompt shipping on in-stock items. Buy now to ensure uninterrupted protection.


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.