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SigmasTek  |  SKU: BW-4891

Best Technologies FERRUPS FE 850VA UPS High Performance Replacement Battery

Sale price $92.48 USD Regular price $134.10
Shipping calculated at checkout.

➤ Replacement battery for Best Technologies FERRUPS FE 850VA UPS units

➤ AGM technology provides maintenance-free, spill-proof reliability

➤ High rate discharge design for emergency power supply

➤ U.L. recognized and CE certified for quality assurance

➤ Brand new with factory fresh condition and 1 year warranty


📦🚀 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.

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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 | 35 AH

Terminal Type

Nut & Bolt

Replacement Best Technologies FERRUPS FE 850VA UPS Battery — Compatible with Best Technologies FERRUPS FE 850VA

This replacement Best Technologies FERRUPS FE 850VA battery delivers dependable compatibility, consistent performance, and reliable protection for your Best Technologies FERRUPS FE 850VA UPS. Designed to meet or exceed OEM SLA battery specifications, this high-performance UPS battery provides spill-proof, maintenance-free operation for mission-critical equipment. If you need a replacement UPS battery that offers long-lasting battery life and seamless fitment for the FERRUPS FE 850VA, this unit gives you the confidence of new, factory-fresh components and verified compatibility at a competitive price.

Key Specifications

  • Compatibility: Best Technologies FERRUPS FE 850VA
  • Technology: Absorbent Glass Mat (AGM) Technology
  • Design: High Rate Discharge Design
  • Maintenance: Maintenance-Free Design with Spill Proof Construction
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year Warranty
  • Voltage: 12 Volts
  • Capacity: 35 AH
  • Terminal Type: Nut & Bolt
  • Brand Information: SigmasTek / Best Technologies
  • Typical Use: Uninterruptible Power Supply (UPS), Emergency Power Supply, Battery Powered Tools

Benefits

Built with Absorbent Glass Mat (AGM) technology and a high rate discharge design, this replacement UPS battery is engineered for durability and reliable performance under load. The maintenance-free, spill-proof construction eliminates routine upkeep and reduces the risk of leakage, making it ideal for indoor UPS installations and emergency power systems. U.L. recognition and CE certification further ensure that the battery meets established safety and quality standards.

As a high-performance UPS battery, it provides stable power delivery during brief outages, protecting sensitive electronics, servers, and network equipment. The 12 Volt, 35 AH capacity and nut & bolt terminals make it suitable for fast, secure installation and consistent energy delivery. Whether used as a direct replacement for your FERRUPS FE 850VA or as a spare for emergency systems, this long-lasting battery design helps extend runtime and maintain uptime for critical loads.

Typical applications include UPS systems, emergency backup power for offices and small data closets, and battery powered tools that require robust discharge capabilities. Its factory-fresh condition and one-year warranty provide added assurance for buyers seeking a reliable replacement UPS battery with proven compatibility for the Best Technologies FERRUPS FE 850VA model.

Ready to restore reliable backup power? Purchase this high-performance, long-lasting replacement UPS battery for your Best Technologies FERRUPS FE 850VA today and ensure uninterrupted protection for your critical equipment.


Payment & Security

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