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SigmasTek  |  SKU: BW-4787

Best Power FERRUPS FER 3.1KVA UPS Compatible Replacement Battery Set 98.89 lb

24% off
New arrival
Sale price $459.99 USD Regular price $601.99
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Four 12V 35AH SigmasTek SP12-35 NB batteries included
High vibration resistance for rugged use
Valve regulated, spill-proof for safe installation
Superior performance meets or exceeds OEM specs
Backed by 1-year warranty and factory freshness
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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.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.


Volts & Amps

12 Volts | 35 AH

Terminal Type

Nut & Bolt

Replacement SigmasTek SP12-35 NB Batteries for Best Power FERRUPS FER 3.1KVA UPS

Keep your Best Power FERRUPS FER 3.1KVA running at peak reliability with this precision-matched replacement UPS battery set. The SigmasTek SP12-35 NB 4-pack is built for high-performance UPS applications, delivering fast-response power, dependable runtime, and the trusted durability you expect for mission-critical equipment. These brand new batteries are an excellent choice when you need a long-lasting battery upgrade that fits seamlessly into your existing configuration.

Key Specifications

  • Included quantity: 4 batteries (battery set)
  • Battery model: SigmasTek SP12-35 NB
  • Voltage: 12 Volts
  • Capacity: 35 AH (amp-hours)
  • Terminal type: Nut & Bolt
  • Design: High Rate Discharge Design
  • Construction: Valve Regulated Spill Proof Construction
  • Self-discharge: Low Self-discharge
  • Durability: High Vibration Resistance
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year Warranty
  • Installation note: Must use all existing cables and hardware from the original configuration to connect the new UPS batteries

Benefits

Designed for consistent high output, these replacement batteries offer robust performance under high-rate discharge conditions — essential for UPS units like the Best Power FERRUPS FER 3.1KVA that must supply surge power for short durations. The valve-regulated, spill-proof design minimizes maintenance while maximizing safety, and the low self-discharge characteristic keeps the batteries ready for action even after storage. High vibration resistance ensures reliable service in rack-mounted or mobile environments, enhancing longevity and reducing the risk of premature failure.

This high-performance UPS battery set is suitable for a wide range of applications: Uninterruptible Power Supply (UPS) installations, emergency power systems, and battery-powered tools that require rapid, reliable discharge. The SigmasTek units are factory fresh and individually tested to meet stringent quality standards, giving you the confidence that your replacement UPS battery will perform when power stability is critical.

Installation is straightforward as long as you retain and reuse the original cables and hardware from your FER 3.1KVA unit. With U.L. and CE certifications and a 1 year warranty, this set offers an excellent balance of safety, reliability, and value for businesses and technicians looking for dependable backup power solutions.

Don’t wait until an outage exposes vulnerabilities — purchase this high-performance, long-lasting battery replacement set for your Best Power FERRUPS FER 3.1KVA today and secure continuous protection for your equipment.

Technical Specifications

Voltage12 Volts
Amp Hours35 AH
Terminal TypeNut & Bolt
Length (in.)7.72
Width (in.)5.14
Height (in.)6.22
Weight (lb.)98.8

Product Highlights

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

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