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-4860

Best Power LI 1.8KVA UPS High Performance Replacement Battery Set 49.45 lb

25% off
New arrival
Sale price $245.99 USD Regular price $329.99
Shipping calculated at checkout.
Replacement set with 2 SigmasTek SP12-35 NB batteries (12V, 35AH)
High rate discharge ideal for Best Power LI 1.8KVA UPS applications
Valve regulated, spill-proof for safe and maintenance-free use
Low self-discharge and vibration resistance enhance durability
Certified quality with U.L., CE, and 1 year warranty included
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 | 35 AH

Terminal Type

Nut & Bolt

Replacement SigmasTek SP12-35 NB Batteries for Best Power LI 1.8KVA UPS

Maintain dependable backup power for your Best Power LI 1.8KVA Uninterruptible Power Supply with this compatible replacement UPS battery set. This set of two SigmasTek SP12-35 NB batteries is engineered for reliable high-rate discharge performance and consistent service life, making it a practical replacement choice for critical systems that require uninterrupted power during outages.

Key Specifications

  • Quantity: 2 batteries per 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 (sealed)
  • Features: Low Self-discharge, High Vibration Resistance, Superior Performance
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year
  • Compatible With: Best Power LI 1.8KVA UPS

Benefits

These SigmasTek batteries offer the durability and performance required for a high-performance UPS battery replacement. The high rate discharge design handles short bursts of high current reliably, while the valve-regulated, spill-proof construction minimizes maintenance and safety concerns. Low self-discharge keeps the batteries ready for service after storage and reduces the need for frequent top-ups. High vibration resistance helps the cells remain stable and reliable in a variety of mounting environments.

Designed as a long-lasting battery alternative, this replacement set is well suited for Uninterruptible Power Supply (UPS) units, emergency power supply systems, and battery-powered tools. It’s an excellent solution for restoring runtime to small server rooms, networking equipment, telecom devices, surveillance systems, medical monitoring gear, and portable power tools where dependable backup is essential. With nut & bolt terminals, installation is straightforward when reusing existing cables and hardware from your original UPS configuration.

All battery sets are factory fresh and tested by knowledgeable technicians to ensure they meet or exceed OEM specifications. U.L. recognition and CE certification add layers of safety and regulatory compliance, and the included one-year warranty gives additional peace of mind.

Ready to replace your old batteries? Order the SigmasTek SP12-35 NB replacement UPS battery set for your Best Power LI 1.8KVA today. For assistance, call our customer support at . Buy now and get fast shipping on in-stock items—protect your equipment with a proven, high-performance UPS battery solution.

Technical Specifications

Voltage12 Volts
Amp Hours35 AH
Terminal TypeNut & Bolt
Length (in.)7.72
Width (in.)5.14
Height (in.)6.22
Weight (lb.)49.4

Product Highlights

  • Brand Replacement : Best Power
  • 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.